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LIBRARY i, 

lUilVERSITY OF CALIFORNIA j 

DAVIS 



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Y OF 8«uf'oRNiA STATE OF CALIFORNIA 

II^ARY 

DEPARTMENT OF WATER RESOURCES 
DIVISION OF RESOURCES PLANNING 



BULLETIN NO. 66 



)UALITY OF GROUND WATERS 

IN CALIFORNIA 
1957 




EDMUND G. BROWN ^7!^^Si»i HARV'^EY O. BANKS 

Governor feft "^ "^j.^^" Director of Water Resources 



APRIL, 1960 



STATE OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

DIVISION OF RESOURCES PLANNING 



BULLETIN NO. 66 



QUALITY OF GROUND WATERS 

IN CALIFORNIA 
1957 




EDMUND G. BROWN R^^mVPi HARVEY O. BANKS 

Governor M v, ^w.jJ^^ Director of Water Resources 



APRIL, 1960 



LIBRARY 

UNIVERSITY OF CALIFORNIA 
DAVIS 



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TABLE OF CONTENTS 

Page 
FRONTISPIECE 

LETTER OF TRANSMITTAL v 

ACKNOWLEDGMENTS vi 

ORGANIZATION, STATE DEPARTMENT OF WATER RESOURCES viii 

ORGANIZATION, CALIFORNIA WATER COMMISSION ix 

SUMMARY OF CONDITIONS, 1957 1 

THE mOUND WATER QUALITY MDNITORING PROGIAM 1 

QUALITY OF ffiOUND WATERS IN CALIFORNIA, 1957 5 

NORTH COASTAL REGION (No. 1) 

Smith River Plain (l-l)* 5 

Butte Valley (1-3) 6 

Shasta Valley (1-4) 7 

Scott River Valley (1-5) 8 

Mad River Valley (1-8) 9 

Eel River Valley (1-10) 10 

Ukiah Valley (1-15) ..... 11 

Sanel Valley (1-16) 12 

Alexander Valley (1-17) 12 

Santa Rosa Valley (1-18) 13 

SAN FRANCISCO BAY REGION (No. 2) 

Santa Clara Valley, East Bay Area (2-9a) 15 

Santa Clara Valley, South Bay Area (2-9b) 16 

Livermore Valley (2-10) 17 



■'-'■Ground water basin number; explanation on page fo\ir. 



Page 
CENTRAL COASTAL REGION (No. 3) 

Pajaro Valley (3-2) 20 

Salinas Valley (3-4) 22 

Carmel Valley (3-7) 24 

Santa Maria River Valley (3-12) 24 

Guyana Valley (3-13) 25 

LOS ANGELES REGION (No. 4) 

Oxnard Plain Pressure Area (4-4.01) 2? 

West Coast Basin (4-11.02) 29 

Area of Sea-Water Intrusion 29 

Torrance Area 30 

Athens Area 31 

Central Coastal Plain Pressure Area and 

Los Angeles Forebay Area (4-11.03 and 4-11.04) 32 

Main San Gabriel Basin (4-13.01) 32 

CENTRAL VALLEY REGION (No. 5) 

Upper Lake Valley (5-13) 34 

Kelseyville Valley (5-15) 35 

Sacramento Valley (5-21) 36 

Sutter County (5-21a) 36 

Yolo County, Capay Valley (5-21b) 37 

Sacramento Coiinty (5-21c) 38 

San Joaquin Valley (5-22) 39 

San Joaquin County (5-22a) 39 

Stanislaus County (5-22b) 41 



XI 



Page 

Merced County (5-22c) 42 

Madera County ($-22d) 44 

Fresno County (5-22e) 45 

Kern County (5-22f) 46 

UHONTAN REGION (No. 6) 
Lower Mojave River Valley, Barstow to Yermo (6-40) 49 

COLORADO RIVER BASIN REGION (No. 7) 
Coachella Valley (7-21) 51 

SANTA ANA REGION (No. &) 

East Coastal Plain Pressure Area (8-1.01) 53 

Chino Basin (8-2.01) 54 

Bunker Hill Basin (8-2.06) 55 

SAN DIEGO REGION (No. 9) 

San Luis Rey Valley (9-7) 58 

El Cajon Valley (9-16) 59 

Tia Juana Basin (9-19) 60 

PUTES 
No. 

1 Monitored Areas, 1957 

2 Status of Sea -Water Intrusion, Santa Clara Valley, East Bay Area 

3 Status of Sea-Water Intrusion, Pajaro Valley 

4 Status of Sea-Water Intrusion, Salinas Valley 



iix 



No. 

5 Status of Sea-Water Intrusion, Oxnard Plain Basin 

6 Status of Sea-Water Intrusion, West Coast Basin 

7 Status of Sea-Water Intrusion, East Coastal Plain Pressure Area 

APPENDIXES 
A Monitoring Area Information 
B Well Data 
C Water Quality 



XV 



EDMUND O. BROWN 
RVEY O. BANKS ovirhou ADDRl»» RIPLY TO 

DinicToii P. o. SOX asa Sacrahinto 2 

ItlO N STRCET HICKORY 5-4711 




STATE OF CALIFORNIA 



SACRAMENTO 



April 11, i960 



Honorable Edmund G. Brown, Governor, and 
Members of the Legislature of the 
State of California 

State and Regional Water Pollution Control Boards 

Gentlemen: 

I have the honor to transmit herewith a report on the quality 
of groiind waters in California during calendar year 1957. This is the 
third in a continuing series of reports on the ground water monitoring 
program conducted by the Department of Water Resources. 

Under this program, water samples from representative wells 
in ground water basins throughout the State are collected and analyzed, 
and an annual evaluation is made of ground water quality conditions. 

This report covers the period from January through December, 
1957, and includes "mineral analyses of ground waters from 13 monitored 
areas in California, The reports on this program for the years 1958 and 
1959 are in preparation and are scheduled for completion during I96O. 

Very truly yours. 



HA R VET «(. BANKS 
Director 



ACKNOWLEDGMENTS 

Field work for the statewide ground water quality monitoring 
program for 1957, reported herein, included collection of about 1,200 
ground water samples from 43 monitored areas in California. The extensive 
coverage was made possible through the cooperation of the following 
agencies: 

United States Geological Survey, Ground Water Branch 

United States Geological Survey, Quality of Water Branch 

Alameda County Flood Control and Water Conservation District 

Monterey County Flood Control and Water Conservation District 

San Bernardino Coionty Flood Control and Water Conservation District 

Del Norte and Humboldt County Farm Advisor 

Kern County Farm Advisor 

Madera County Farm Advisor 

Mendocino County Farm Advisor 

Siskiyou County Farm Advisor 

Sonoma County Farm Advisor 

Stanislaus County Farm Advisor 

Orange County Air and Water Pollution Control District 

San Joaquin Local Health District 

California Water and Telephone Company, National City 

Central California Irrigation District 

Merced Irrigation District 

Turlock Irrigation District 

West Side Irrigation District 

West Stanislaus Irrigation District 



vx 



Many of the analyses presented in this report were made by the 
United States Geological Survey, Quality of Water Branch, at its Sacramento 
laboratory, under a continuing cooperative agreement with the Department of 
Water Resources. 

The valuable assistance and cooperation of these agencies is 
gratefully acknowledged. 



Vll 



ORGANIZATION 
STATE DEPARTMENT OF WATER RESOURCES 
DIVISION OF RESOURCES PLANNING 



Harvey 0. Banks Director of Water Resources 

Ralph M. Brody Deputy Director, Special Counsel 

James F. Wright Deputy Director, Administration and Management 

William L. Berry Chief, Division of Resources Planning 

H. G. Dewey, Jr Chief, Special Activities Branch 

The activity under which this report has been 
prepared is directed by 

Meyer Kramsky Principal Hydraulic Engineer 

The activities in northern California are 
under the supervision of 

Willard R. Slater Supervising Hydraulic Engineer 

The activities in southern California are 
under the direction of 

John R. Teerink District Engineer 

and the supervision of 

David B. Willets Supervising Hydraulic Engineer 

This report was prepared by 

Arthur J. Inerfield Senior Civil Engineer 

Robert F. Clawson Senior Hydraiilic Engineer 

Eldon E. Rinehart Associate Hydrographer 

assisted by 

Wayne S. Gentry Associate Civil Engineer 

Felix W. Cartier Civil Engineering Associate 

Eugene C. Ramstedt Assistant Civil Engineer 

Chester Lao Assistant Engineering Geologist 

Ralph Paul Junior Civil Engineer 

Edwin E. Crawford Junior Hydrographer 

Norman J. Scott, Jr Engineering Aid II 



Paul L. Barnes Chief, Division of Administration 

Porter A. Towner Chief Counsel 

Isabel C. Nessler Coordinator of Reports 



Vlll 



ORGANIZATION 
CALIFORNIA WATER COMMISSION 



James K, Carr, Chairman, Sacramento 
William H. Jennings, Vice Chairman, La Mesa 
John W. Bryant, Riverside John P. Bunker, Gustine 

Ira J. Chrisman, Visalia George C. Fleharty, Redding 

John J. King, Petalioma Kenneth Q. Volk, Los Angeles 

Marion R. Walker, Ventura 



George B. Gleason 
Chief Engineer 



William M. Carah 
Executive Secretary 



ax 



SUMMARY OF CONDITIONS 
1957 



Degradation by sea-water intrusion into coastal basins continued 
to be the major threat to quality of ground waters in California during 
1957. Sea-water intrusion was evidenced by increased mineralization in 
ground water in the following areas: Santa Clara Valley, Pajaro Valley, 
Salinas Vailley, Oxnard Plain, West Coast Basin, East Coastal Plain, San 
Luis Rey Valley, and Tia Juana Basin. In several other basins, significant 
increases or decreases in mineral concentration were noted in individual 
wells. However, these changes appear to be due to localized conditions and 
do not necessarily reflect basin-wide water qusility trends. Ground water 
quality in the majority of the monitored areas, including the vast Central 
Valley Region, remained essentially unchanged from that found in 1956. 

THE GROUND WATER QUALITY MONITORING PROGRAM 

About one-half of California' s presently developed water supply 
is derived from ground water storage. The consequent widespread dependence 
upon ground water as a source of supply, together with the recognized need 
for more intensive utilization of ground water storage to meet future water 
requirements, demands constant vigilance, coupled with remedial action 
where necessary, to assure that the quality of ground water remains suitable 
for all intended uses. Accordingly, a statewide program of observation and 
compilation of records of ground water quality was initiated in 1953* 

Presented in this report are the analyses and evsiluations of 
samples collected during 1957. Data for previous periods are included 
in the following reports: California Department of Public Works, Divi- 
sion of Water Resources, Water Quality Investigations, Report No. Ik, 



-1- 



"Ground Water Quality Monitoring Program in California", Progress Report 

1953-1954; and California Department of Water Resources, Division of 

Resources Planning, Bulletin No. 66, "Quality of Ground Waters in California, 

1955-1956." 

The ground water quality monitoring program is authorized by 

Section 229 of the Water Code. This section provides that: 

"The department (of Water Resources) ... shall investigate 
conditions of the quality of all waters within the State, in- 
cluding saline waters, coastal and inland, as related to all 
sources of pollution of whatever nature and shall report thereon 
to the Legislature and to the appropriate regional water pollu- 
tion control board annually, and may recommend any steps which 
might be taken to improve or protect the quality of such waters." 

The objectives of the program are: 

(1) To provide information on the prevailing mineral quality 
of ground waters. 

(2) To provide a reliable continuing check on quality of ground 
waters . 

(3) To secure data relating to significant changes in mineral 
quality, to evaluate the causes for these changes and to 
identify and delineate the areas affected by such changes. 

(4) To notify the appropriate regulatory agencies regarding 
the findings of the program. 

(5) To provide the required data on ground water quality for 
the purpose of water development planning and construction. 

During 1957, water samples were collected and analyzed from 43 
ground water basins or portions of basins in California. Requests and 
suggestions from regional water pollution control boards and other inter- 
ested water agencies were considered in selecting areas for monitoring. 



-2- 



Monitored areas are divided into the following broad categories: 
areas where water quality problems are known to exist; areas where extensive 
use is made of the ground water resources and where thtTe are potential 
water quality problems; and areas in which ground water is not presently 
used extensively, but it is desirable to secure data on native water quality 
conditions in anticipation of future development. 

Frequency of sampling depends largely on the nature and imminence 
of the quality problem. Only a minimum number of wells necessary to delimit 
accurately the problem or to evaluate ground water conditions are included 
in the monitoring network. The selection of wells is also governed to a 
large extent by the availability of well logs and accessibility of wells for 
sampling. Sufficient information must be available on each well such as 
depth, aquifers encoimtered, and depths of perforations to assure that data 
obtained are useful. (In 1958, the program' was expanded to include radio- 
logical determinations in addition to the usual mineral analyses in all of 
the monitored areas. This will provide background information for evalua- 
tion of the effects of the ever-increasing uses of radioactive materials.) 

The information presented for each monitored area includes a 
general description of the area, an evaluation of water quality problems, 
the number of wells sampled, the frequency of sampling, and cin evaluation 
of the data collected diiring the reporting period. 

A tabulation showing the number of wells sampled in each area in 
1957, and the sampling times, as well as a summary of information pertain- 
ing to occurrence, development, and use of ground water for each of the 
monitored areas is presented in Appendix A. 

To facilitate geographical orientation, the areas are grouped by 
water pollution control regions, the boundaries of which, in most cases. 



-3- 



coincide with those of the major drainage basins of the State* These region- 
al boundaries and the areas included in this monitoring program are shown on 
Plate 1. 

The region and basin numbers in this report are based on a decimal 
system in the form x-xx.xx. The number to the left of the dash refers to 
the region of a water pollution control board. On the right of the dash, 
the first digits refer to the basin, valley or cirea; and the digits to the 
right of the decimal refer to the sub-basin number. A letter is also used 
following the first digits to the right of the dash to identify portions of 
ground water basins within a county. These numbers are used to identify the 
monitored areas in the text, in the data tables, and on Plate 1. 

The location of the monitored wells and other data thereon, to- 
gether with an explanation of the well n\ambering system, is presented in 
Appendix B. Ground water analyses obtained during 1957 are presented in 
Appendix G by monitored areas. Also included in Appendix C are discussions 
of laboratory methods and procedures and criteria for appraising the suit- 
ability of water for various uses, A "monitored area" is defined as that 
portion of a ground water basin which lies within the limits of an estab- 
lished network of monitored wells. It does not necessarily include the 
entire groundwater basin. 



-4- 



QUALITY OF mOUND WATERS IN CALIFORNIA, 1957 
NORTH COASTAL REGION (No. 1) 

The North Coastal Region comprises all of the basins draining into 
the Pacific Ocean from the California-Oregon state line southerly to the 
northern boundary of Lagunitas Creek drainage area in Marin County (Plate 1), 
It extends approximately 270 miles from north to south, ranges in width from 
180 miles at the Oregon boundary to about 30 miles in the southern portion, 
and encompasses an area of about 19,000 square miles. 

All or parts of ten ground water basins in the North Coastal Region 
have been included in the ground water quality monitoring program. Of these. 
Smith River Plain, Ukiah Valley, and Sanel Valley have been reported pre- 
viously. Butte Valley, Shasta Valley, Scott River Valley, Mad River Valley, 
Eel River Valley, Alexander Valley, and Santa Rosa Valley were added to the 
program in 1957. 

Smith River Plain (1-1) 

Smith River Plain is located adjacent to the coast in the north- 
western portion of Del Norte County, The plain extends approximately 18 
miles north to south, varies in width from about four to seven miles, and 
encompasses aji area of about 70 square miles. It is the largest alluvial 
area in the county. 

The mineral quality of ground water in Smith River Plain is gener- 
ally good, and no major problems presently exist. However, there are several 
potential sources of ground water degradation. Among these are a threat of 
sea-water intrusion along the coast, encroachment of brackish water from 
Lake Earl, and possible local contamination from septic tanks in the vicinity 
of Crescent City. Monitoring of the area on an annual basis was initiated 



-5- 



in 1956. The monitoring network in Smith River Plain consisted of I5 wells 
in 1957. 

Ground waters of Smith River Plain are generally a magnesium 
bicarbonate type of excellent mineral quality. However, minor increases in 
nitrates and total dissolved solids occurred in several of the monitored 
wells in 1957. The most notable increase occurred in well 16n/1W-20A2, 
located approximately one mile north of Crescent City. The nitrates in this 
well increased from 19 to 48 parts per million (ppm) between December, 1956, 
and December, 1957, and the total dissolved solids showed an increase from 
108 to 166 ppm during the same period. This increase cannot be attributed to 
any specific source. However, because there have been instances of contam- 
ination by effluent from individual sewage disposal systems, any increases 
in nitrates in the area should be viewed with suspicion. It is anticipated 
that subsequent analyses may determine whether or not this increase indicates 
a definite trend. The mineral constituents in the other monitored wells 
showed little change during the same period. In general, total dissolved 
solids ranged from 57 to 182 ppm, and boron concentrations were less than 
0.06 ppm. The sodium ratio varied between 8 and 51 per cent, and hardness 
from 18 to 121 ppm. Ten of the 15 monitored wells contained water with less 
than 67 ppm total hardness. See Appendix G. 

Butte Valley (l->3) 

Butte Valley lies in the northeastern part of Siskiyou County, 
about 30 miles south of the Oregon border and east of the Cascade Range, 
The valley floor is an irregularly-shaped area comprising approximately 130 
square miles. 

Ground water in Butte Valley is generally of the bicarbonate type. 



-6- 



with moderate mineral concentrations, although locally some wells produce 
water high in mineral content. These highly mineralized ground waters 
probably originate in buried playa deposits which occur in the east side 
of the valley, A monitoring program of ten wells was established in Butte 
Valley in 1957. These wells will be sampled annually to maintain a check 
on any movement of highly mineralized water into the good quality water. 

The analyses for 1957 show that the waters from nine of the moni- 
tored wells were of excellent quality; total dissolved solids did not exceed 
294 ppm, chlorides were less than 8 ppm, and hardness was less than 130 ppm. 
However, water sampled from well 47N/1W-23H1, one of the wells located in the 
eastern part of the valley, contained 2,670 ppm total dissolved solids, 
979 ppm sulfates, 328 ppm chlorides, and 760 ppm total hardness, reflecting 
the presence of mineralized water discussed previously. The boron content 
of water from this well was 1.5 ppm, while boron content of water sampled 
from the other wells did not exceed 0.17 ppm, 

Shasta Valley (1-4) 

Shasta Valley lies in the central part of Siskiyou County, between 
the Klamath Mountains on the west and the Cascade Range on the east. The 
valley is nearly oval in shape, has a north-south length of about 30 miles, 
a maximum east-west width of about 15 miles, and includes an area of approx- 
imately 250 square miles. 

The ground waters in Shasta Valley are generally of excellent 
mineral quality, with bicarbonate the dominant anion. No extensive ground 
water quality problems are known to exist. However, waters high in sodium, 
boron, and potassium are found at some points in the northwestern portion of 
the valley. The presence of these highly mineralized waters, probably due 



-7- 



to the migration of poor quality waters known to be present in certain 
geologic formations in the area, prompted the establishment, in 1957 of a 
monitoring network of six wells in this area which "Were sampled twice during 
the year (Appendix A), 

The analyses of samples from the monitored wells indicate that 
the ground waters were generally of good mineral quality in 1957, although 
most of the waters were hard. Total hardness varied from 95 to 376 ppm, 
with four of the six wells having hardness in excess of 230 ppm. The 
highest boron concentration, 1.2 ppm, occurred in the water from well 
44N/4W-6M1, located in the northeast portion of the valley. Per cent sodium 
ranged from 7 to 45j and total dissolved solids ranged from 162 to 594 ppm, 
with the highest concentration in water from well 44N/5W-32F1 near the center 
of the area, 

Scott River Valley (1-5) 

Scott River Valley is located in the western portion of Siskiyou 
County, and lies about 28 miles south of the California-Oregon boundary. 
The valley has a north-south length of 22 miles, a maximum width of about 
10 miles, and comprises an area of approximately 80 square miles. 

The ground waters of Scott River Valley are generally of excellent 
mineral quality and are suitable for most beneficial uses, although most are 
moderately hard. In 1957, an annual monitoring network of four wells was 
established to detect any change in water quality. 

The analyses of ground water samples collected during 1957 show 
that the total dissolved solids did not exceed 275 ppm, chlorides were 
less than 6 ppm, and boron did not exceed 0.13 Ppm- Three of the sampled 
wells yielded waters which were moderately hard with total hardness less 
than 185 ppm. The fourth well contained water with a total hardness of 
233 ppm, 

-8- 



Mad River Valley (1-8) 

Mad River Valley lies north of Humboldt Bay in Hxomboldt County, 
cind is bordered on the north and east by the Coast Range, and on the west 
by the Pacific Ocean, The monitored portion of the valley is roughly rec- 
tangular in shape, averages about six miles in a north-south direction, 
and extends inland from the coast an average of about three miles. 

Ground waters in Mad River Valley are characteristically a mag- 
nesium bicarbonate type suitable for most beneficial uses. However, there 
are indications that sea-water intrusion may exist in the coastal segment 
of this valley, A monitoring program of six wells was established in 1957 
to maintain a check on the occurrence of sea-water intrusion and the quality 
of ground waters in the basin. In this first year, samples were collected 
in February and December, In subsequent years, samples will be collected 
annually. 

Wells 6N/1E-7M1 and 6n/1E-18J1, located in the central portion 
of the monitored area, produced hard water in December, 1957, with total 
hardness of 252 and 233 ppm, respectively. Well 6k/1W-1P1, located near 
the mouth of Mad River and on the fringe of the area susceptible to sea- 
water intrusion, showed an increase in total dissolved solids from 2,710 ppm 
in February, 1957, to 4,480 ppm in December, 1957, Chlorides increased 
from 1,460 to 2,520 ppm during the same period. This well is no longer 
used for domestic and irrigation purposes, but is still being used to supply 
washdown water for a dairy. Several wells in the area just south of the 
mouth of Mad River have been abandoned, possibly due to intrusion of sea 
water. These high chloride ground waters occur in an area about three- 
quarters of a mile in length, extending about one-half mile inland from 
the coast line. 



-9- 



Eel River Valley (1-10) 

Eel River Valley is the largest valley fill area in Humboldt 
County. The monitored portion of Eel River Valley is about 8 miles wide 
at the coast, extends inland about 12 miles to the confluence of the Eel 
and Van Duzen Rivers, and includes an area of about 75 square miles. 

The ground waters of this area are generally hard, but are suitable 
for most uses, A seaward hydraulic gradient exists over the entire basin 
most of the year. Heavy pumping occurs during the summer season and lowers 
the water table below sea level over an extensive area. When this condition 
exists, saline water from the tidal portion of Eel River may enter and degrade 
fresh-water bearing deposits. To maintain continuous observation on the 
quality of groimd water in this area, an annual monitoring network of 11 
wells was established in 1956. To obtain more complete information, four 
of the wells were sampled twice during 1957. 

The analyses of samples from these wells in 1957 show total 
dissolved solids ranging from 84 to 842 ppm, with the highest concentration 
in well 3N/2W-13J1, located one mile south of Loleta. Wells near to and 
west of the Eel River yielded moderate to hard waters, with the hardest 
waters being found in wells closest to the river. Total hardness ranged 
from 34 ppm in well 3N/1W-18D2, to 630 ppm in the aforementioned well 3N/2W- 
13 Jl. Sodium percentage ranged from 7 to 60, with 7 wells containing 30 
per cent sodi\im or less. Boron did not exceed 0,33 Ppm in any of the moni- 
tored wells. Chloride concentrations near the coast, and in the vicinity 
of the tidal portion of Eel River, were much higher than those generally- 
found in the rest of the valley. Well 3N/2W-35M1, located approximately 
3g miles from the coast and 2 miles south of the river, contained 172 ppm 
chlorides in December, 1956, and 310 ppm chlorides in October, 1957, 



-10- 



ITorth of the Eel River, ground water from well 3N/2W-13J1, located about 
three miles inlajid, had a chloride concentration of 390 ppra. Well No, 
3N/1W-29C1 located about six miles inland from the coast produced water 
containing 63 ppni chlorides. 

Ukiah Valley (1-15) 

Ukiah Valley comprises about 65 square miles of alluvial fill 
area along the Russiain River in the east-central portion of Mendocino County. 
The valley is approximately 22 miles in length, and varies in width up to 
5 miles. 

Highly mineralized ground waters occur along the eastern edge 
of the valley, probably originating from mineralized springs in the area. 
The importance of the ground water supply to the economy of this area prompted 
the establishment of a monitoring network in 1953. The network comprised 
11 wells in 1957 which were sampled annually. 

Water samples from nine of the eleven wells showed little evidence 
of progressive change in mineral concentration. However, the quality of 
waters from the remaining two wells, 15N/12W-8D1 and well 17N/12W-18A1, 
fluctuated considerably. Waters from well 15N/12W-8D1, located about two 
miles north of Ukiah, indicated a cyclic variation in mineral constituents; 
total dissolved solids decreased from 235 ppm in August, 1953, to 111 ppm 
in December, 1956, then increased to 240 ppm in August, 1957. Waters from 
well 17N/12W-18A1, located in the northern portion of the valley about seven 
miles north of Calpella, decreased in total dissolved solids content from 
1,120 ppm in December, 1956, to 1,080 ppm in August, 1957; during this same 
period, boron concentration decreased from 73 to 45 ppm. 

Per cent sodium in the monitoring wells ranged from 14 to 85, 
with the highest value from well 17N/12W-18A1. Well 14N/12W-5K1, located 



-11- 



approximately three miles south of Ukiah, had a total hardness of 246 ppm, 
while hardness in the other monitored wells ranged from 90 to 164 ppm. 
Boron, in concentrations exceeding the limits recommended for irrigation 
use, was present in waters from wells 14N/12W-26K1 and 17N/l2W-lfiAl. 

Sanel Valley (1-16) 

Sanel Valley is an irregularly shaped area located in the south- 
eastern portion of Mendocino County. It is traversed by the Russian River 
in a north-south direction and comprises an area of about 11.5 square miles. 

Groimd waters in Sanel Valley are characteristically magnesium- 
calcium bicarbonate in type, and are generally suitable for most beneficial 
uses. However, ground waters in portions of the area contain high boron 
concentrations. Due to the importance of ground water supplies to the 
economy of this valley, and the presence of boron in excessive quantities, 
an annual monitoring network of six wells was established in the area in 
1956. 

A comparison of mineral analyses of samples collected in 1957 
with those collected. in 1956 indicates no significant changes in nature 
or concentration of mineral constituents. Total dissolved solids in ground 
water samples collected in Sanel Valley ranged between 152 and 235 ppm. 
Boron concentration was 1.5 ppm in well 13N/11W-18D1, and 1.2 ppm in well 
13N/11W-18B1, both of which are located approximately 1.5 miles north of 
Hopland, but did not exceed 0.52 ppm in the other monitored wells. Sodium 
did not exceed 22 per cent of the base constituents in any of the waters 
sampled 

Alexander Valley (J-l?) 

Alexander Valley lies along the Russian River in the north-central 



-12- 



portion of Sonoma County. The monitored area has a length of approximately 
14 miles, an average width of about 1.5 miles, and comprises about 20 square 
miles. 

Ground water in Alexander Valley is generally of low mineral 
content and suitable for most beneficial uses; however, waters high in boron 
occur in local areas throughout the valley. Disposal of winery waste water 
into unlined ponds is a potential source of degradation of ground water in 
the northern portion of Alexander Valley. To determine whether any impair- 
ment of ground water quality is occurring, an annual monitoring network of 
nine wells was established in 1957» 

A study of analyses of water samples collected from monitored 
wells indicates that in 1957, ground water varied considerably in mineral 
characteristics. Sodium percentage ranged from 8 to 84. Well 10N/9W-32R1, 
located approximately 1,5 miles southeast of Geyserville, yielded water with 
492 ppm total dissolved solids, the highest value for any of the monitored 
wells in this valley. Three of the nine monitored wells yielded ground 
water with total hardness above 200 ppm. Boron content was 1.8 ppm in wells 
10N/9W-iaU and 11N/10W-33A1, and 1.3 ppm in well 9N/9W-1P1. Boron did not 
exceed 0.28 ppm in water from the other wells, 

Santa Rosa Valley (1-18) 

Santa Rosa Valley is the largest and most impo_'tant valley fill 
area in Sonoma County. This monitored area comprises ab .'Ut 90 square 
miles, has a length of about 20 miles, and a width of 4 to 7 miles. Bennett, 
Rincon, and Kenwood Valleys, which lie east of Santa Rosa Valley, are also 
included in this monitored area. 

The quality of ground water in Ssinta Rosa Valley is generally 
satisfactory for most uses. However, high concentrations of boron occur 



-13- 



locally, and sodium percentages in some waters are in excess of those 
recommended for irrigation use. An annual monitoring network of 20 wells 
was established in this area during 1957 to maintain a check on the water 
quality and to detect any changes. 

Mineral analyses of grovind water samples collected from monitored 
wells in 1957 show a concentration of total dissolved solids ranging from 
127 to 354 ppm in all wells except 6n/7W-18R1, located approximately four 
miles south of Santa Rosa, which had a total dissolved solids content of 
6/i5 ppm. Per cent sodium was 91 in well 6N/7W-17E1, but did not exceed 
63 per cent in water from the remaining wells. The highest concentration 
of boron, 1.2 ppm, was found in water from well 6N/7W-17E1. Boron did not 
exceed 0.23 PPm in the other wells sampled. Total hardness ranged from 
20 to 168 ppm, except for well 6N/7W-18R1, where hardness was 426 ppm. 



-14- 



SAN FRANCISCO BAY REGION (No. 2) 
San Francisco Bay Region includes all of the basins which drain 
into San Francisco Bay, San Pablo Bay, and that portion of Suisun Bay below 
Antioch. It includes parts of Marin, Sonoma, Napa, Solano, Contra Costa, 
Alameda, Santa Clara and San Mateo Counties, and all of San Francisco County. 
The region extends about 125 miles from north to south, averages 45 miles in 
an east-west direction and comprises an area of about 4,400 square miles 
(Plate 1). 

Within the boundaries of the San Francisco Bay Region, 11 major 
ground water basins have been identified. As of 1957, two of these basins, 
Santa Clara and Liverraore Valleys, were included in the ground water quality 
monitoring program. For piirposes of discussing ground water quality, Santa 
Clara Valley has been divided into two areas. East Bay and South Bay. 

Santa Clara Valley, East Bay Area (2-9a) 

The East Bay Area of Santa Clara Valley in the monitoring program 
comprises about 140 square miles of alluvial land in Alameda County, between 
San Francisco Bay and the foothills of the Diablo Range. The area extends 
northerly from the Alameda-Santa Clara County line about 40 miles sind ranges 
in width from 2 to 11 miles. 

The groxind water reservoir formed in alluvial material which has 
been deposited by Alameda Creek between Niles and the San Francisco Bay 
is termed the Niles cone^ Because of prolonged overuse of ground water 
supplies, the water table has been lowered below sea level for many years 
and saline bay waters have invaded shallow water-producing gravels. In 
recent years, saline waters have been detected in deeper water-producing 
gravels which are separated from the shallower zones by extensive clay 
layers. To maintain surveillance on the quality of ground water in the 



-15- 



area subject to sea-water intrusion, a program was established in 1953 to 
monitor the upper and the lower aquifers. The monitoring network in 1957 
consisted of 15 wells sampled twice a year. 

Analyses of samples collected from the monitored wells show that 
chloride concentrations in well 4S/lW-30K3, which is located near Centervllle 
and penetrates the lower aquifer, increased from 352 ppm in 1953, to 1,940 
ppm in 1957. Water from well 4s/lW-29Kl, located about 0.3 mile south of 
Centerville, and drawing from the upper aquifer, had a chloride concentration 
of 1,355 ppm in 1957, an increase of 1,117 ppm since 1953. This increase 
indicates that the inland advance of sea water is continuing. A chloride 
concentration of 564 ppm in well 3S/2W-32R1, located about four miles south 
of Hayward, indicates possible sea-water intrusion in the upper aquifer in 
that area. 

The 1957 analyses show the following ranges in constituents: 
chlorides, from 27 to 1,940 ppm; total dissolved solids, from 229 to 3,510 
ppm; boron, from 0.14 to 0.83 Ppm; and per cent sodium, from 14 to 64. 
Nitrate concentrations of 71, 72, and 82 ppm were found in waters sampled 
from wells 3S/3W-3L1, 2S/3W-36M1, and 3S/2W-21F1, respectively. The first 
two wells are located in San Leandro and the third in Hayward. The sources 
of these nitrates are not known. 

The status of sea-water intrusion in the East Bay Area of Santa 
Clara Valley is shown on Plate 2. 

Santa Clara Valley, South Bay Area (2-9b) 

The South Bay Area of Santa Clara Valley included in the monitoring 
program lies within Santa Clara County and extends from Palo Alto southerly 
to San Jose. The monitored area is about 10 miles north to south, approx- 
imately 15 miles east to west, and contains about 150 square miles. 



-16- 



Ground waters in the South Bay Area are threatened by sea-water 
intrusion which has existed in the tidelands area adjacent to San Francisco 
Bay for many years. In addition, ground waters in the Penitencia Creek area 
contain high boron concentrations. Due to the importance of ground water, 
and the presence of grouna water quality problems, this area was included in 
the monitoring program in 1953 for continued observation. The 1957 moni- 
toring network consisted of 17 wells sampled annually. 

Comparison of mineral analyses of samples obtained in 1957 from 
the monitored wells shows that the only significant change in water quality 
was the increase in the chloride concentrations in wells 5S/3W-35G1 and 
6S/1W-14L4. Chlorides in water from well 5S/3W-35G1, located about three 
miles south of the bay in Palo Alto, increased from 64 ppm in October, 1955, 
to 198 ppm in August, 1957. Chloride concentrations in water from well 
6s/lW-14L4> located about two miles southeast of Alviso, increased from 
31 ppm in October, 1955 to 139 ppm in August, 1957. It is believed that this 
chloride rise is due to sea-water intrusion. Well 6s/lW-14L4 yielded water 
with a total dissolved solids concentration of 1,110 ppm, which is the 
maximum value found in the monitored wells. Water from the remaining moni- 
tored wells was of good to excellent mineral quality, with 695 PPm being the 
maximum concentration of total dissolved solids. The maximum boron concen- 
tration in the wells sampled in 1957, was 1.0 ppm, with 12 of the monitored 
wells having concentrations less than 0.20 ppm. Per cent sodium ranged 
from 15 to 67, with only three of the monitored wells having a per cent 
sodiiora above 42. Most of the wells yielded very hard water, with total 
hardness ranging from 70 to 646 ppm, 

Livermore Valley (2-10) 

The monitored portion of Livermore Valley is located in the eastern 



-17- 



portion of Alameda County, with a minor area extending iito Contra Costa 
County. The valley has an east-west length of about 1/+ miles, varies in 
width from 3 to 6 miles, and encompasses an area of about 50 square miles. 

An annual monitoring proecram was established in 1953 due to the 
dependence of the area on ground water supplies, and the presence in the 
ground water of boron and nitrates in excessive quantities. In 1957j water 
samples were collected from 45 wells. In connection with a special study of 
the occurrence of nitrates in the valley, additional samples were collected 
from 36 of these wells. 

In 1957j ground waters in the northeastern part of the valley 
contained chlorides ranging from 286 to 1,450 ppm. Boron ranged between 
3.7 and 28 ppm, and sodium percentage ranged from 72 to 77. Chloride was 
the predominant anion in these waters, and total hardness was in excess of 
170 ppm. Although the ground waters in this portion of the valley continued 
to be the poorest in mineral quality encountered in the monitored area, little 
change from previous analyses was noted. 

Ground water in the central and southern portion of the valley 
contained total dissolved solids and boron concentrations of less than 560 
and 0.92 ppm, respectively . In this portion of the valley total dissolved 
solids increased slightly over 1956 values. 

Mineral concentrations varied in waters from wells in the vicinity 
of Livermore and the eastern part of the valley. Boron ranged from 0.11 
to 6.5 ppm, with the highest concentration in wells located just south and 
east of Livermore. The highest concentration of total dissolved solids and 
boron was found in water from well 3S/3E-19C1, located about five miles 
southeast of Livermore. Sodium exceeded 50 per cent of base constituents 
in only two of the monitored wells in this part of the area. Nitrate concen- 
trations in water from six of the monitored wells in the vicinity of Livermore 



-18- 



exceeded 44 ppm, the limiting value recommended by the California State 
Department of Public Health for domestic use, as presented in Appendix C. 

No significant trends or changes were noted in mineral concentra- 
tions in comparison with previous analyses. 



-19- 



CENTRAL COASTAL REGION (No. 3) 
The Central Coastal Region extends from the southern boundary 
of Pescadero Creek Basin in Santa Cruz County to the northeastern boundary 
of Rincon Creek Basin in Ventura County. The region is characterized by 
narrow coastal strips and coastal valleys with moderate slopes toward the 
ocean, backed by mountain ranges paralleling the coast. It averages 50 
miles in width and encompasses an area of approximately 11,000 square miles 
(Plate 1). 

Valley areas in the Central Coastal Region, except for a few 
isolated sections, receive moderate rainfall, and depend largely on ground 
water as a source of supply. Approximately 90 per cent of the water require- 
ments of this region are supplied from ground water sources. Nineteen ground 
water basins, eighteen of which are utilized intensively to supply irriga- 
tion waters, have been identified in the Central Coastal Region. Five of 
these ground water basins have been included in the monitoring program, 

Pa.jaro Valley (3-2) 

Pajaro Valley comprises an irregularly shaped area of about 75 
square miles lying in the Pajaro River drainage basin below Chittenden Pass. 

Ground waters in Pajaro Valley occur in three distinct zones, 
designated, the shallow, intermediate, and deep zone. The shallow zone 
extends from land surface to a depth of about 100 feet. The intermediate 
zone lies between 100 and 300 feet and the deep zone occurs below 400 feet. 
Shallow zone ground water is often of poor quality. Ground water in the 
intermediate zone is generally suitable for most irrigation uses, and is 
the present main source of supply. The limited data available concerning 
water quality in the deep zone indicate it to be of excellent mineral quality. 
Sea-water intrusion into intermediate zone ground water adjacent to Monterey 



-20- 



Bay prompted the inclusion of Pajaro Valley into the monitoring program in 
1953. Samples are collected on an annual basis; during 1957, 25 wells were 
sampled. 

Ground waters in Pajaro Valley contain moderate concentrations of 
calcium and bicarbonates, low concentrations of magnesium, sodium and boron, 
and moderate to high total hardness. The presence of chlorides in significant 
amounts is limited to a zone adjacent to Monterey Bay. 

Comparison of mineral analyses of ground water samples collected 
from wells in Pajaro Valley during 1957 with previous analyses revealed no 
significant change in quality of ground water. In the area north of the 
Pajaro River, sea water had intruded the intermediate zone for a distance of 
about one-half mile in 1957, and in the Springfield district, as far inland 
as McClusky Slough. The intrusion extended somewhat further inland along the 
Pajaro River. Well 12S/lE-24J2 located about one mile inland from the ocean 
showed a chloride concentration of 132 ppm. This well marks the approximate 
extent of sea-water intrusion. Wells 12S/lE-25B2 and 12S/lE-25Cl, located 
about three-quarters of a mile inland from the ocean and within 1,000 feet 
of each other, draw from the deep zone, and in 1957 yielded water with 
chloride concentrations of 17 and 162 ppm, respectively. While the higher 
chloride concentration indicates that sea water may have intruded the deep 
zone, the chloride concentration in this well has not varied more than 5 Ppm 
since 1955. Ground waters in the major portion of the valley contained 
total dissolved solids generally less than 400 ppm, boron concentrations 
less than 0.30 ppm, and per cent sodium less than 35. However, wells located 
in the eastern end of the valley yielded waters with boron concentrations 
less than 1.4 ppm, and total dissolved solids concentrations usually in 
excess of 65O ppm. 



-21- 



The status of sea-water intrusion in Pajaro Valley is shown on 
Plate 3. 

Salinas Valley (3-4) 

Salinas Valley is the largest valley in the Central Coastal Region. 
The monitored portion is approximately 40 miles in length, varies in width 
from 2 to 10 miles, and contains about 300 square miles of highly productive 
irrigated and dry- farmed land. 

Ground waters in Salinas Valley occur principally in three aquifers. 
These consist of an upper unconfined aquifer and two lower confined aquifers 
known as the 180-foot aquifer and the 400-foot aquifer. A serious water qual- 
ity problem exists, caused by the intrusion of sea water into overdrawn 
fresh-water aquifers in the portion of Salinas Valley adjacent to Monterey 
Bay. Two miles inland from the bay shore, ground water has been degraded to 
such an extent by saline water that it is either unfit for agricultural use, 
or is near the upper limit of quality suitable for such use. An annual 
monitoring program was established in this area in 1953, primarily for the 
purpose of monitoring sea-water intrusion into the 180-foot and 400-foot 
aqLiifers. 

Samples were collected from 47 wells in this area during 1957. 
Comparison of mineral analyses of samples collected from monitored wells 
since 1953 shows that, except for a slight increase in chlorides in several 
of the wells, there was little change in quality characteristics during the 
period. 

In the vicinity of Castroville, sea water had intruded inland 
about three miles in the 180-foot aquifer in 1957. The continued inland 
advance of sea water in the 180-foot aquifer is indicated by the increase 
of chlorides in some of the wells which pump from this zone. Chloride 



-22- 



concentrations in well 13S/2E-30L1, located about one-half mile from the coast, 
increased from 139 ppm in 1955 to 166 ppm in 1957. Chloride concentrations 
in well 13S/2E-32J1, located about one-half mile southwest of Castroville, 
and well 14S/2E-5R2 about two miles southwest of Castroville, which were 
100 and 52 ppm, respectively, in 1953, increased to 495 Ppm and 122 ppm in 

1957. 

Well 13S/2E-19R1, about a mile and a half northwest of Castro- 
ville, which pumps from the 400-foot aquifer, showed chloride concentrations 
of 154 ppm in 1956, and 236 ppm in 1957. This increase of chlorides in the 
400-foot aquifer was not evidenced in samples from wells located south of 
Castroville, Well 13S/2E-31M2 in this area showed an 11 ppm decrease in 
chlorides during the same period. These changes suggest that the inland 
advance of sea water is ccntinuing only in that portion of the 400-foot 
aquifer which lies directly west of Castroville. 

Analyses of water from wells in the portion of Salinas Valley not 
subject to sea-water intrusion, however, indicate that the ground waters, 
while hard, are of excellent quality. Boron concentrations vary, depending 
upon the locality. In 1957, gro\ind waters in the central portion of the 
valley between Gonzales and Soledad showed a boron range between 0.2 and 
0.7 ppm, while few wells in the remaining portion of the monitored area 
had a boron concentration exceeding 0.2 ppm. Total dissolved solids general- 
ly did not exceed 400 ppm, except in areas where moderate concentrations of 
boron were found. In these areas, total dissolved solids ranged from 500 to 
1,420 ppm. 

The status of sea-water intrusion in Salinas Valley is shown on 
Plate 4. 



-23- 



Carmel VaUey (3-7) 

Carrael Valley is located about three miles south of the City of 
Monterey, and is a long alluvium-filled valley extending eastward from the 
coast a distance of about 23 miles. However, only the coastal portion of 
Carmel Valley, which might be susceptible to sea-water intrusion, is included 
in the monitoring program. 

Ground waters of Carmel Valley are a calcium bicarbonate t;;ye and, 
with the exception of hardness and iron, are of excellent mineral quality. 
An annual monitoring program was established in this area in 1953 to detect 
sea-water intrusion. Data from the sampling program indicates that there 
has been no significant variation in mineral characteristics of ground waters 
during the period of record. There has been no evidence of sea-water intru- 
sion to date in the seven wells which comprise the present network. 

Due to sampling difficulties, only two of the seven wells in the 
monitoring network were sampled in 1957. These wells are located approx- 
imately 0.9 mile and 1.7 miles inland from the coast and contained chloride 
concentrations of 40 ppm and 103 ppm^ respectively. Hardness ranged from 187 
to 298 ppm, and the iron content was in excess of the maximum limit recom- 
mended for domestic use. 

Santa Maria River Valley (3-12) 

The Santa Maria River Valley ground water basin extends inland from 
the ocean along the Santa Maria River, a distance of 28 miles. It averages 
9 miles in width and includes about 180 square miles. 

An annual ground water quality monitoring program was established 
in 1953 in Santa Maria River Valley basin. The program is primarily con- 
cerned with the detection of degradation in quality of ground water which 
might result from oil field operations or sea-water intrusion. While most 



-24- 



of the oil field brine is conveyed to the ocean by pipe line, there is a 
possibility that ground water quality could be degraded by accidental spillage 
of oil field brines or percolation from sumps. In addition, should ground 
water levels near the ocean be depressed below sea level, the producing 
ground water aquifers would be threatened with sea-water intrusion. 

During 1957> water samples were obtained from 10 monitoring wells. 
Analyses indicate that the ground water is of a calcium-magnesium sulfate 
type throughout the basin. The waters are very hard and sulfates greatly 
exceed the recommended limit of 250 ppra for drinking water; additionally, 
they are low in boron, per cent sodium, and suitable for irrigation of most 
crops. 

Analyses of waters sampled in 1?57 show the following ranges for 
significant mineral constituents: total dissolved solids content, from 
799 to 2,198 ppra; chlorides, from 40 to 140 ppm; sulfates, from 365 to 1,091 
ppm; boron, from zero to 0.80 ppm; and per cent sodium, from 15 to 29. 

Although a few of the wells have s^iOwn gradual degradation, with 
increases in chlorides, sulfates, and total dissolved solids, there was no 
significant basin wide variation in mineral quality during the period 1953- 
1957. 

Cuyama Valley (3-13) 

The Cuyama Valley ground water basin extends along the Cuyama 
River, a distance of 35 miles, varies from 1 to 4 miles in width, and com- 
prises about 125 square miles. 

The possible degradation of ground water quality by oil industry 
wastes and mineralized springs, principally in the northern and north- 
western part of the basin, prompted the establishment of an annual monitoring 



-25- 



program in this valley in 1953. During 1957, samples were collected from 
six wells in Cuyama Valley. 

The character of the ground water is generally calcium-magnesivun 
sulfate. Although the water is not well suited for domestic purposes, due 
to extreme hardness and high sulfate concentrations, it is low in boron 
and per cent sodium and is considered suitable for irrigation of most 
crops. 

Analyses of water samples collected during 1957 indicate the 
following ranges of mineral constituents: total dissolved solids, from 
698 to 4,062 ppm; chlorides, from 18 to 76 ppm; sulfates, from 389 to 
2,433 ppm; total hardness, from 183 to 2,200 ppm; boron, from 0.05 to 
0.24 ppm; and per cent sodium, from 13 to 63. 

Comparison of analyses of well waters obtained in 1957 with 
those of the four preceding years, indicates that no significant change 
in mineral quality has occurred in this period. 



-26- 



LOS ANGELES REGION (No. 4 ) 

The Los Angeles Region extends from the southeastern boundary of 
the watershed of Rincon Creek in Ventura County to the Los Angeles-Orange 
County boundary, a distance of approximately 100 miles. It extends from the 
Pacific Ocean inland to the drainage divide, an average distance of 50 miles, 
and encompasses an area of approximately 4,260 square miles (Plate 1), The 
region is characterized by broad coastal plains and inland valleys, backed by 
mountainous topography. The Ventura, Santa Clara, Los Angeles, and San 
Gabriel Rivers are the principal streams of this region. 

The ground water supply of the region has been extensively developed. 
In many areas, the safe yield of the basins has been exceeded. Supplemental 
water supplies are imported from Mono and Owens Valleys and the Colorado 
River. 

Sixteen ground water basins and 40 sub-basins have been identified 
in the Los Angeles Region. However, only five basins or sub-basins have 
been included in the monitoring program, 

Oxnard Plain Pressure Area (4-4.01) 

The Oxnard Plain pressure ar ^a is a flat, gently sloping plain, 
roughly triangular in shape, comprising approximately 73 square miles. This 
area fronts on the Pacific Ocean for a distance of 16 miles and extends inland 
a maximtim distance of about 8 miles. 

The main water-bearing zones in Oxnard Plain pressure area are 
called, in order of depth, the Oxnard, the Hugu, and the Fox Canyon aquifers, 
all of v/hich are open to the sea. The intrusion of sea water into the 
Oxnard aquifer at Port Hueneme and the Mugu and Oxnard aquifers near Point 
Mugu has been evident for several years. At Port Huenenie, the sea-water 
front has moved inland into the Oxnard aquifer for distances up to one and 



-27- 



one-half miles from the shore line. The intrusion is caused by excessive 
pumpage of ground wattjr, resulting in lowered water levels and the creation 
of a landward hydraulic gradient. The monitoring program in Oxnard Plain 
pressure area was initiated in 1953. VJells in the present program are 
situated in and around the area of sea-water intrusion. 

During 1957, 31 samples were obtained from 20 wells. The mineral 
analyses of these samples indicate that ground waters in Oxnard Plain 
pressure area, where not affected by sea-water intrusion, were suitable for 
irrigation of most crops, except those sensitive to boron. The waters were 
hard and marginal for domestic use because of high sulfate content. Chlorides 
ranged from 40 to 73 ppm, sulfates from 123 to 643 ppm, total dissolved 
solids from 720 to 1,390 ppm, and total hardness from 363 to 765 ppm. Boron 
ranged from 0.17 to 1.10 ppm. 

At Port Hueneme, in the area of sea-water intrusion, well 1N/22W- 
20R1 showed a chloride content of 6,896 ppm in May, 1957. This well yielded 
water with a chloride content of 23 to 43 ppm in the early months of 1951. 
In September 1951? the chloride content rose to 1,285 ppm. Since that time, 
the chloride content has fluctuated widely with no seasonal pattern. Well 
1N/22V/-28A2 showed an increase in chlorides from 49 ppm in December, 1956, to 
71 ppm in December, 1957. 

No significant changes in total dissolved solids, total hardness, 
chloride content, or general character of the ground water are apparent out- 
side the areas of intrusion. Some of the wells, however, showed a slight 
decrease in total dissolved solids and chloride content. 

The status of sea-water intrusion in Oxna.-d Plain basin, as of 1957, 
is presented on Plate 5. 



-28- 



West Coast Basin (4-11.02) 

West Coast Basin is one of several basins in the Coastal Plain of 
Los Angeles County. It is approximately 19 miles long and averages 9 miles 
in width. In general, its surface is a jently rolling, lightly eroded plain, 
with an area of about 160 square miles. 

The principal aquifers imderlying West Coast Basin comprise the 
Silverado v^fater-bearing zone and the "400-foot gravel" in the San Pedro 
formation. A condition of overdraft exists in the basin, resulting in sea- 
water intrusion extending more than one mile inland along the Santa Monica 
Bay coast into the Silverado water bearing zone. Industrial waste dis- 
charges have affected wells in the Torrance and Athens areas. Monitoring 
programs for each of these areas are currently in effect to detect and to 
determine the extent of ground water impairment from these sources. Each 
of these areas is treated in detail in the discussions which follow. 

Area of Sea-Water Intrusion. The area monitored for sea-water 
intrusion borders the coast line of Santa Monica Bay. The wells selected 
for the monitoring program, which commenced in 1953^ are situated in a 
15-square-mile area, extending from the northerly limit of the City of El 
Segundo southward to the vicinity of the City of Redondo Beach. During 
1957j six v;ells were sampled in this area. Two of the wells were sampled 
twice during this year and the remaining wells were sampled once. 

Water from the monitored wells contained chlorides ranging from 
85 to 1,004 ppm, and total dissolved solids ranging from 528 to 1,900 ppm in 
1957. The quality of water in well 3S/l5W-12Gl has fluctuated widely since 
1953. During the period October, 1956, to December, 1957, chlorides increased 
from 285 to 452 ppm, and total dissolved solids increased from 804 to 
1,257 ppm. Well 3S/l5W-13R2 showed an increase in chlorides from 239 PPm 



-29- 



in May, 1956, to 368 ppm in March, 1957; and, in the same period, total 
dissolved solids increased from 728 to 1,100 ppm. if/ell 4S/L4W-8FI showed an 
increase in chlorides from 398 ppm in June, 1955, to 1,004 ppm in June, 1957, 
while total dissolved solids increased from 982 to 1,900 ppm. No appreciable 
changes were noted in analyses of water from the other monitored wells. 

The Manhattan Beach Injection Project, operated by the Los Angeles 
County Flood Control District, has apparently been successful in forming 
a fresh-water barrier to sea-water intrusion into the Silverado Zone at 
Manhattan Beach on Santa Monica Bay. However, sea-water intrusion appears 
to be advancing on either side of the line of injection wells and encroaching 
on the flanks of the protected area. The status of sea-water intrusion in 
West Coast Basin is presented on Plate 6, 

Torrance Area. The Torrance area is bounded by 190th Street 
on the north, Main Street on the east. Pacific Coast Highway on the south, 
and Santa Monica Bay on the west, and comprises an area of about 30 square 
miles. Wells chosen for monitoring are situated in and around the City of 
Torrance. 

Wastes from the oil and other heavy industries discharged to 
surface siimps and drainage channels in and near the City of Torrance have 
seriously affected ground water quality in the upper aquifers. 

The monitoring program comprises five wells, selected in 1953 
to determine the advance of this pollution and its possible impairment of 
water quality in the lower aquifers. Impairment of water quality in the 
lower water-bearing zones could occur by interchange of water in the 
different aquifers through improperly constructed or abandoned wells or 
by hydraulic continuity between aquifers. 

Analyses of water from monitored wells showed chlorides ranging 



-30- 



from 70 to 205 ppmj sulfates from to 501 ppm, total dissolved solids 
from 450 to 1,170 ppm, and total hardness from 152 to 643 ppm. No signi- 
ficant change in quality of water from monitored wells was noted between 
1956 and 1957. 

Athens Area. The Athens area extends approximately from Florence 
Avenue north of the City of Inglewood to 190th Street on the south, and 
from Sepulveda Boulevard on the west to Alameda Boulevard on the east, and 
comprises an area of about 50 square miles. Seven wells, chosen for moni- 
toring in this area in 1953, are grouped in the vicinity of the City of 
Gardena. They have been selected to detect deterioration of ground water 
quality resulting from past and present oil '.veil, oil refinery, and other 
industrial wastes discharged to surface channels and sumps. The monitored 
area encompasses about 25 square miles. 

Analyses of samples collected during 1957 indicate that the total 
dissolved solids content ranged from 408 to 1,484 ppm, chlorides from 48 
to 342 ppm, sulfates from 40 to 184 ppm, and total hardness from 145 to 
663 ppm. 

Analyses of water from well 3S/13W-29G3 show an increase in 
chlorides from 43 ppm in 1953 to 71 ppm in 1957, a.nd in total dissolved 
solids from 484 ppm in 1953 to 553 ppm in 1957. 

With the exception of nitrates, the concentration of minerals 
in water from v;ell 3S/l3W-3lFl has increased at a fairly uniform rate since 
1953. The nitrate concentration has steadily declined from 47 ppm in 1953 
to 16 ppm in 1957. Comparison of 1957 analyses with those available for 
previous years shows no significant changes in the water from the other 
monitoring wells. 



-31- 



Central Coastal Plain Pressure and Los Angeles 
Forebay Areas (4-11.03 and 4-11.04) 

Central Coastal Plain Pressure Area and Los Angeles Forebay Area 
are sub-basins of the Coastal Plain, Los Angeles County. They extend 
northwest-southeast about 22 miles and average about 12 miles in width. 

The monitored area includes portions of both the Central Coastal 
Plain Pressure Area and the Los Angeles Forebay Area, and is centered in the 
vicinity of the City of Huntington Park. 

The monitoring program was established in this area in 1953 to 
observe the duration of polluting effects from past waste discharges. The 
program in 1957 consisted of six wells sampled twice annually. Analyses 
of samples obtained from monitoring wells during calendar year 1957 show 
that total dissolved solids content ranged from 387 to 636 FPro? chlorides 
from 20 to 90 ppm, and hardness from 212 to 373 ppm. 

Comparison of 1957 analyses with the prior year's analyses shows 
minor increases in total dissolved solids and chlorides in several of the 
wells, but reveals no significant changes in the mineral quality. 

Main San Gabriel Basin (4-13.01) 

Main San Gabriel Basin, located in Los Angeles County, is an 
interior valley sloping gently from the San Gabriel Mountains 9 miles south- 
ward to the Merced and Puente Hills, encompassing an area of about 115 
square miles. 

A lag in providing waste disposal facilities presents a potential 
threat to ground water quality. This area was included in the monitoring 
program in 1953 to detect any water quality changes which might be attrib- 
utable to the disposal of large quantities of sewage and industrial wastes. 

Concentrations and ranges of pertinent constituents, as determined 



-32- 



from mineral analyses of samples obtained from 11 monitoring wells during 
1957, were as follows: total dissolved solids ranf^ed from 215 to 806 ppm, 
chlorides from 10 to 105 ppni, and nitrates from 1.0 to 47 ppm. 

Comparison of 1957 analyses with prior analyses indicates, in 
general, only minor changes and fluctuati' ns in mineral c'.>ncentrations. 
An exception is well ls/lOW-19Nl, where chlorides and sulfates showed the 
following trends: 



Date 


Chlorides 
in ppm 

24 

67 
113 
105 


Sulfates 
in ppm 


3/27/55 
5/25/55 
12/27/56 
6/14/57 


59 
199 
357 
317 



These changes are attributed to the percolation of Colorado River water 
from an unlined channel in the vicinity of this well. 



-33- 



CENTH-lL VALLEY REGION (Mo. 5) 
The Central Valley Region extends from the California-Oregon 
line southward to the Tehachapi Mountains, and from the Coast Range on the 
west to the Sierra Nevada on the east. It averages 120 miles in width and 
is more than 500 miles in length. The region comprises an area of approximate- 
ly 59^000 square miles, and includes about 38 per cent of the land surface 
and nearly 44 per cent of the valley and mesa lands of the State (Plate 1). 

Two major valleys, the San Joaquin and the Sacramento, are located 
in this region. These valleys contain the largest bodies of usuable ground 
water in the State. The presence of numerous potential sources of water 
quality impairment requires that constant vigilance be maintained to assure 
the continued usefulness of this important source of water supply. 

Of 29 ground water basins identified in this region, only Kelsey- 
ville Valley and Upper Lake Valley in Lake County, and portions of the Sac- 
ramento and San Joaquin Valleys have thus far been included in the monitoring 
program. 

Upper Lake Valley (5-13) 

Upper Lake Valley, which borders on and lies north of Clear Lake 
in Lake County, extends about seven miles north from the shore line of Clear 
Lake, and includes an area of about 16 square miles. Boron is present in 
excessive amounts in a few of the wells in the western and southern portions 
of the valley. The need to detect any migration of the high boron waters into 
other wells prompted the establishment of a monitoring program of two wells 
in the area in 1953. 

Analyses of samples obtained from two wells in 1957 show that the 
groiind water contained less than 10 ppm of chlorides, and less than 15 ppm 
of sodium. 



-34- 



No boron was shown in analyses of ground water sampled in Upper 
Lake Valley during 1957, indicating that boron had not degraded water in 
the monitored wells. Comparison of the results of analyses of 1957 samples 
with those of 1953 showed virtually no change. 

Kelseyville Valley (5-15) 

Kelseyville Valley is a gently rolling plain bordered by Clear 
Lake on the north. The monitored area is about seven miles in length from 
north to south and five miles in width, and encompasses approximately 30 
square miles. 

This area was included in the monitoring program in 1953 because of 
the presence of high concentrations of boron in the ground waters from some 
wells in the eastern and northern portions of the valley and the possibility 
that this high boron water may migrate into other wells. The program in 1957 
comprised 10 v.-ells which were sampled once in July. 

Maximum concentrations of sodium and chloride in ground waters 
sampled in 1957 were 25 ppm and 18 ppm, respectively. Water from well 
131^/9^-1601 contained a boron concentration of 0.60 ppm, the highest value for 
the monitored wells. The per cent sodium ranged from 7 to 35, with seven of 
the ten monitored wells yielding waters with less than 10 per cent sodium. 
The ground water generally ranged from moderately hard to hard. Comparison 
of mineral analyses of samples collected from the monitored wells between 
July, 1953, and July, 1957, shows decreases in the boron concentrations, 
ranging betv;een 0.07 and 0.16 ppm. The maximum change occurred in well 
13N/9W-12M1, where the boron concentration decreased from 0.50 ppm in 1953 
to 0.34 ppm in 1957. There were no significant changes in the other reported 
mineral constituents. 



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Sacramento Valley (5-21) 

The portion of the Central Valley which lies generally north of the 
Cosumnes River is known as the Sacramento Valley. The valley floor comprises 
an area of approximately 5? 000 square miles and contains the second largest 
ground water reservoir in the State. 

As of 1957j three areas had been included in the monitoring program 
in Sacramento Valley: Sutter County, Capay Valley, and Sacramento County. 
Of these, Sutter and Sacramento Counties vjere reported previously, and Capay 
Valley was added to the program in 1957. 

Sutter County (5-21a) Most of the area in Sutter County served 
by ground water supplies is included in the monitoring program. The majority 
of the monitoring wells are located in an area between the Feather River and 
Sutter By-Pass, extending about 18 miles north to south. Also included is 
an area in the eastern part of the county south of Bear River and a small 
area near Robbins in the southwest part of the county. 

Mineral quality of native ground water supplies in Sutter County 
is excellent to good, except for hardness which ranges from moderate to hard. 
In local areas, however, high chloride concentrations are found. Because of 
these high chlorides, an annual ground water quality monitoring program was 
initiated in 1953. 

During 1957, samples were collected from 33 wells. Three wells, 
12N/2E-llia, 12N/2E-16R1, and 12N/2E-23Q1, showed sodium percentages in 
excess of 75 per cent. Chlorides ranged between 2.7 and 1,330 ppm, with ten 
of the monitored wells exceeding 175 ppm chlorides. In the sampled wells, 
boron ranged as high as 0.83 PPm; however, only six wells yielded water with 
boron concentrations in excess of 0.50 ppm. Total hardness exceeded 200 ppm 



-36- 



in 19 of the monitored wells, and was between 36 and 200 ppra in the renain- 

ing wells. 

Comparison of mineral analyses of samples collected from the moni- 
toring network indicates little change in the quality characteristics of the 
ground water sampled. Chloride content increased moderately in samples from 
five wells between June, 1955, and July, 1957. The maximum increase was 
80 ppm in v/ell 1/+N/3E-28R1. During the same period, however, chloride con- 
centrations decreased 89 ppm, 10? ppm, and 151 ppm in wells 13N/3E-14R1, 
13N/3E-23B1, and 14N/3E-16B2, respectively. This fluctuation in chlorides 
has been investigated previously and indications are that deep-seated connate 
brines underlie the area. The increase in chloride content is probably caused 
by upward migration of brines into the fresh-water aquifers during periods 
of heavy irrigation pumping, and the decrease by repulsion of these brines 
during periods of abundant rainfall when ground waters are replenished. 

Yolo County, Caray Valley Area (5-21b) The Capay Valley area 
extends northwesterly from the community of Capay to Rumsey in the v;e stern 
portion of Yolo County. The area included in the monitoring program is 
about 15 miles in length and ranges from 1 to 2 miles in width. 

Capay Valley was included in the monitoring program in 1957 
because of high boron concentrations in ground water underlying portions of 
the valley. Ground water in Capay Valley is predominantly Class 2 irri- 
gation water, and is moderately to very hard. The monitoring network in 1957 
consisted of nine wells, sampled in July. 

Study of the available analyses indicates that ground water quality 
in Capay Valley is highly variable. In 1957, total dissolved solids ranged 
from about 306 to 1,090 ppm, the maximum value being found in water from 
well 10N/2W-18F2. Chloride concentrations varied from 8.0 ppm in well 



^37- 



10N/2W-23A1 to 205 ppm in well 10N/2W-18F2. Although sodium ranged from 
30 to 40 per cent in most of the ivells, well 10N/2W-17J1 had a sodium per- 
centage of 81. Boron concentrations ranged from 0.37 to 1.6 ppm, with six 
of the sampled wells having boron in excess of 0.74 ppm. 

Sacramento County (5-21c) Most of Sacramento County, except 
the portion along the eastern boundary underlain by formations which yield 
negligible quantities of ground water, has been included in the monitoring 
program. An annual sampling program was initiated in this area in 1955. 

Ground water of excellent mineral quality occurs generally 
throughout the county; however, there are localized areas where water quality 
is a problem. A potential source of degradation to ground water quality 
in the eastern portion of the coimty is an industrial waste discharge from 
the Aerojet-General Corporation's plant. This discharge contains potassium 
perchlorate (KCIO/^) and ammonium per chlorate (NH/^CIO/^) in solution. The 
perchlorates of potassium and ammonium are reported to be toxic to plant 
life to approximately the same extent as boron. Determinations for ammonium 
and perchlorate ions are included in the analyses of ground water from wells 
in this vicinity. Ground water contains less than 350 ppm total dissolved 
solids, and less than 0.3 ppm boron. Total hardness ranges from 43 to 202 
ppm and per cent sodium generally does not exceed 50. 

In 1951) ground water samples were, collected from 27 wells in 
Sacramento County. Comparison of the analyses of samples from the monitored 
wells since 1955 shows no significant change or trend in mineral characteris- 
tics of ground water in Sacramento County. However, water from well 8n/4E- 
26D1 contained 0.70 ppm boron in July, 1957, as compared with no boron in 
February, 1956. The reason for the boron increase in water from this well 
has not as yet been determined. 



-38- 



Mineral analyses of samples collected in 1957 showed 1.0 ppra per- 
chlorate ion (ClO/^^) and no ammoniiim ion (NH/^) present in ground water in 
the vicinity of the aircraft industry plant, indicating that these consti- 
tuents were not present in excessive amounts. Well 9N/7E-28B1 showed a 
decrease- in perchlorates from 18 ppm in May, 1956, to 1 ppm in September, 
1957. 

San Joaquin Valley (5-22) 

The San Joaquin Valley includes about 10,000 square miles of 
irrigable soils and extends from the Tehachapi Mountains north to the vicinity 
of the Cosumnes River. Underlying this valley is the largest ground water 
reservoir in the State. A bed of diatomaceous clay, commonly referred to as 
the Corcoran clay, continuous throughout most of the San Joaquin Valley, 
separates the water-bearing formation in this reservoir into an upper and 
lower zone. This clay bed is about 40 to 50 feet in thickness and generally 
lies between 300 and 350 feet below land surface. Wells in the western 
portion of the valley draw water principally from the lower zone due mainly 
to the poor quality of upper zone waters, 'Wells in the remainder of the 
valley produce good quality waters from both zones. 

There are presently several ground water quality problems in the 
San Joaquin Valley. Monitoring programs have been established in each of 
these problem areas. 

San Joaquin County (5-22a) The area included in the monitoring 
program in San Joaquin County comprises most of the valley floor. The area 
extends from the Sacramento County line on the north to the Stanislaus County 
line on the south, and ranges in width from about 14 to 30 miles. 

Groiind water in San Joaquin County is, in general, suitable for 



-39- 



both domestic and agricultural use, although soi^ie of the water contains 
moderately high boron concentrations. In the vicinity of the City of Stock- 
ton, a threat to water quality exists due to saline water bodies which under- 
lie the area and extend throughout most of the delta lands in the northwestern 
part of the county. 

A water quality monitoring program was established in the vicinity 
of Stockton in 1953^ and extended to include most of the county in 1957. 
The purpose of this program is to maintain a check on the possible migration 
of the poor quality water in the western part of the county, and to detect 
any degradation due to movement of these waters into the eastern part of the 
county. The monitoring network in San Joaquin County in 1957 comprised 43 
wells sampled annually during the irrigation season. Twenty-five of the wells 
are located in the southwestern portion of the county, and the remaining 
18 wells are distributed throughout the central and eastern portion of the 
county, 

V/ells in the western portion of San Joaquin County yielded waters, 
in 1957j containing boron in concentrations ranging from 0.53 to 5.7 ppm. 
Fifteen of the sampled wells had boron in excess of 1.0 ppm, while only 
three wells had boron concentrations exceeding 2.0 ppm. Total dissolved 
solids exceeded 700 ppm in 12 of the west side wells. Of all the wells 
sampled in this area, only well 2S/4E-36P1 had water with less than 400 ppm 
total dissolved solids. Total hardness exceeded 200 ppm in 27 of the wells, 
indicating that hard ground waters exist in the western portion of San Joaquin 
County. Sodium ranged between 35 and 60 per cent in most of the monitored 
wells, 

Gro\md waters in the central and eastern portions of the covinty 
contained concentrations of total dissolved solids in 1957j ranging from 



-40- 



about 200 ppra to 1,500 ppm. Sodium ranged between 18 and 85 per cent, with 
the higher ranges in the vicinity of Stockton. Ten of the sampled wells 
yielded water with a sodium percentage greater than 50 per cent. Fourteen 
of the wells monitored in the central and eastern portion of the county 
yielded water with a total hardness of less than 150 ppm. Boron ranged 
between 0.10 and 1.10 ppm with 13 of the monitored wells exceeding 0.50 ppm. 

Analyses show only minor changes in concentrations of mineral 
constituents in the wells which have been sampled since 1953. These changes, 
in general, are slight increases in sodium, chlorides, and total dissolved 
solids, 

Stanislaus County (5-22b) The monitored portion of Stanislaus 
County covers approximately 800 square miles and includes all of the valley 
floor in Stanislaus County except for an area of about 185 square miles in 
the north central portion. 

Ground waters in Stanislaus County are similar in mineral quality 
to the surface waters, constituting the principal source of replenishment. 
Wells in the east side of the area generally yield bicarbonate water of 
excellent quality, while west side grouna v/aters are of variable type and 
are moderately high in sulfates, chlorides, and boron. Wells in the trough 
of the valley produce sodium chloride waters that range in concentration 
from about 450 to 5,700 ppm total dissolved solids. 

An annual monitoring program of 45 wells was established in 
Stanislaus County in 1957 because of numerous potential sources of groimd 
water quality impairment. 

Analyses of samples collected in Stanislaus County during 1957 
indicate a wide range in concentration in several of the mineral constituents. 
Total dissolved solids ranged between 199 ppm in water from well 4S/llE-21Dl 



-41- 



and 2,760 ppm in well 3S/l3E-32Dl. The chloride concentrations in water from 
these two wells, 4.2 and 1,620 ppm, respectively, were the minimum and maximum 
values found in the sampled wells. The boron content v;as generally less than 
0.5 ppm, although one well, 4S/7E-16E1, produced water with a boron content of 
2.5 ppm. Per cent sodium did not exceed 89 per cent in any of ^he sampled 
wells. 

Water from 22 of the monitored wells showed total hardness in excess 
of 200 ppm and would be classed as hard. Sulfate concentrations in excess of 
250 ppm, the maximum value recommended for drinking water, were found in water 
from five of the monitored wells. 

Merced County (5-22c ) Two separate areas are included in the 
monitoring program in Merced County. One area extends along the west side 
of the valley floor between the Stanislaus and Fresno County lines. This 
area varies in width from 6 to 8 miles, is about 32 miles in length and in- 
cludes about 225 square miles. It encompasses the land in Merced County served 
by Central California Irrigation District. The second area is located in the 
central part of the county. It is from 10 to 12 miles in width, about 40 
miles in length and includes about 400 square miles. Merced Irrigation 
District and that portion of Turlock Irrigation District in Merced Goimty 
are located in this second area. 

Alth''Ugh ground water in the western part of the county has a 
high chloride content, the predominant anions are sulfate and bicarbonate. 
Wells in the central portion, less than 200 feet in depth, yield calcium 
bicarbonate water of excellent quality. Ground water from the deeper wells 
is of similar anionic composition; however, they generally have a much higher 
sodium content. An annual monitoring program of 41 wells v/as established 
in Merced County during 1957 to maintain surveillance on water quality 



-42- 



conditions, and to detect possible movement of mineralized water near the 
trough of the valley. 

Wells sampled in the central, portion of Merced County yielded 
waters of excellent mineral quality in 1957. Total dissolved solids did not 
exceed 300 ppm in 18 of the monitored wells and the pei cent sodium did not 
exceed 50 per cent in 21 of the sampled wells. Maximum values, 545 ppm 
total dissolved solids and 68 per cent sodium, were found in water sampled 
from well 6s/lOE-2SKl. Boron ranged from to 1.9 ppm in the sampled waters. 
Ground waters from these wells were slightly to moderately hard, with only 
well 7S/l5E-30El showing a total hardness in excess of 200 ppm. 

Ground water samples from wells in the western portion of the 
county showed highly variable mineral quality. Total dissolved solids in 
the well waters ranged from 333 to 2,690 ppm and per cent sodium from 26 
per cent to 64 per cent. V/aters from four of the wells contained total 
dissolved solids concentrations in excess of 1,000 ppm, with the highest 
value found in well 11S/10S-23K1. Eight of the monitored wells yielded 
water with boron concentrations less than 0.50 ppm; although ground water 
samples from wells 12S/llE-3Cl, 11S/10E-23K1, and 9S/9E-21F1 contained 
boron in concentrations of 2.8, 1.9, and 1.3 ppm, respectively. Total 
hardness varied between 122 and 1,170 ppm with nine of the wells yielding 
water with total hardness in excess of 200 ppm. 

Waters from well 12S/llE-3Cl and 11S/10E-23K1 contained sulfate 
concentrations of 468 and 885 Ppm, respectively. The latter well also 
contained 77 ppm nitrates. These concentrations are in excess of the sulfate 
and nitrate limits recommended by the State Department of Public Health 
for drinking water, as presented in Appendix C. 



-43- 



Madera County (5-22d) All of the valley floor land in Madera 
County is included in the monitoring pro-am. It extends from the foot- 
hills on the east to the San Joaquin River on the west, and from the Merced 
County line on the north to the Fresno County line on the south. 

Calcium-sodiiim bicarbonate type waters of excellent mineral 
quality are found, generally, in wells less than 350 feet deep. Water in 
the lower zones in the western part of the county, effectively confined by 
the Corcoran clay, is predominantly of sodium bicarbonate type, v;ith sodium 
percenta ;es often exceeding limits recommended for irrigation waters. Wells 
in the western part bordering the San Joaquin River yield waters high in 
chlorides. 

The existence of high chloride concentrations in portions of the 
aquifers and high percentage sodium in the lower water bearing zones prompted 
the inclusion of Madera County in an annual monitoring program in 1957. 
During 1957, samples were collected from 28 vjells. 

Study of the analyses of mineral constituents in the waters from 
the monitored wells indicates ground waters in Madera County were generally 
of excellent quality in 1957. In 27 of the 28 monitored wells, total dis- 
solved solids did not exceed a concentration of k25 ppm; whereas, well 
11S/14E-20L1 yielded water with 1,220 ppm total dissolved solids. Ground 
water from the monitored v;ells had a maximum boron concentration of 0.17 ppm. 
In 25 of the monitored wells, per cent sodium ranged from 27 to 49 per cent, 
while wells 13S/l5E-22Jl, 12S/l4E-17Bl and 12S/l4E-34Hl showed sodium per- 
centages in excess of 80 per cent. These latter wells are located in the 
western portion of Madera County and produce water from a depth of 240 to 
250 feet. Ground waters for the most part, ranged from soft to moderately 
hard, with only three of the monitored wells having a total hardness in 
excess of 200 ppm. 



-44- 



Fresno County (5-22e) The monitored area in Fresno County en- 
compasses that portion of the valley floor area generally lying west of the 
San Joaquin River and Fresno Slough and includes an area lying east of Fresno 
Slough, in the vicinity of Raisin City Oil Field, The monitored area extends 
approximately 72 miles in a northwest-southeast direction, averages about 
20 miles in width, and covers about 1,300 square miles. 

A serious water quality problem exists in the west side area of 
Fresno County. Highly mineralized waters occur above and below the Corcoran 
clay. High boron concentrations are found in ground waters in local areas and 
evidence exists of ground water degradation by oil field wastes. 

There are two major water-bearing zones in the west side area. 
Quality of water in these zones is variable. The upper zone, which extends 
to a depth 200 to 300 feet below the land surface, yields a calcium-magnesium 
sulfate water with a total dissolved solids content of about 3} 000 ppm and 
a sodiiun percentage of 35. The lower zone yields a sodium sulfate water with 
a total dissolved solids concentration of about 800 ppm and sodium ranging 
from 70 to 90 per cent. This lower zone furnishes about 80 per cent of the 
ground water supply in the area. 

These existing and potential problems prompted the inclusion of 
this area in an annual monitoring program in 1953. During 1957, samples 
were collected from 51 wells in the west side area and 16 wells in the 
vicinity of the Raisin City Oil Field. Nearly all the monitored wells yield 
water from the lower zone. 

Wastes from Raisin City Oil Field operations are presently being 
disposed of by injection into deep wells. These v;ells are more than 1,500 
feet in depth and the waste is injected into the underlying saline water 
body. Previously, however, the oil field wastes were discharged into unlined 



-45- 



sumps, and final disposal was by means of evaporation and percolation. 

Water from wells adjacent to these sumps have, in the past, contained chloride 

concentrations in excess of the general quality level in ground water. 

Boron concentrations ranging from 1,0 to 3.5 ppm was found 
in 32 of the 51 wells sampled in this area in 1957. Fourteen wells yielded 
water with sodium in excess of 75 per cent and the total hardness in water 
samples from 36 of the wells exceeded 200 ppra. 

Comparison of partial mineral analyses of samples collected in the 
West Side Area during the five-year period of record shows no definite 
trends in chloride, sodium or boron concentrations. 

In the vicinity of Raisin City Oil Field, analyses show that, 
except for three wells in which chlorides are increasing, sodium and chloride 
concentrations generally did not exceed 130 ppm. Eleven of the monitored 
wells yielded water with total hardness ranging from 12 to 84 ppm and, except 
for well 15S/l7E-13Gl, the monitored wells all showed boron concentrations 
less than 0.57 ppm. Per cent sodium, hovjever, exceeded 75 per cent in samples 
from nine of the monitored wells. 

Sodium and chloride concentrations in water from three wells 
increased significantly during the period of record. The most notable in- 
crease occurred in waters from well 15S/l7E-13Gl, where chloride concentra- 
tions increased from 2,010 ppm in 1955 to 27,400 ppm in 1957. This well 
also showed significant increases in sodium, boron, and total hardness 
concentrations . 

Kern County (5-22f) The monitoring program in Kern County en- 
compasses that area extending from the northern boundary of Kern County 
south to '//heeler Ridge and lying between the Coast Range and the Tehachapi 
Mountains. The area is approximately 60 miles in length and averages 35 iniles 



-46- 



in width. Edison ajid Devils Den Oil Field Areas, which were previously- 
reported separately, are now included in this monitoring area. 

Ground waters in Kern County vary considerably in mineral charac- 
teristics. High concentrations of boron and other constituents occur in the 
monitored area, notably in the southern and western portions. Inferior 
quality water and oil field waste waters are potential degradants. The 
mineral concentrations in ground waters of Devils Den Oil Field area are in 
excess of the recommended limits for domestic use and for irrigation water 
for most crops. Oil field waste waters in this area are disposed of in 
evaporation or percolation basins located in natural depressions on hillsides 
and in gullies. These depressions are adapted for waste disposal by the 
construction of earthen dikes and impounding dams. Seepage and overflow of 
the waste waters pose a potential threat to quality of ground water within 
the oil field area. 

Available data concerninp the nature of ground waters in Sunflower 
Valley indicate that they are inferior in quality. Concentrations of total 
dissolved solids and boron generally exceed 1,000 and 1.5 ppm, respectively. 
Ground waters are extremely hard in this area, with total hardness ranging 
from 511 ppm to 1,520 ppm. 

To observe and record any changes in the mineral character or 
concentration of mineral constituents, an annual monitoring program consist- 
ing of 42 wells was established in Kern County. Monitoring in the Edison and 
Devils Den Oil Field Areas was started in 1953 and the remainder of the area 
was included in 1957. 

Total dissolved solids in water from wells located in the southern 
portion of the monitored area ranged from 218 to 4,430 ppm with about half 
of the wells yielding water with more than 1,000 ppm. Wells contained boron 



-47- 



concentrations ranging from 0.28 to 4.1 ppm, and, except for one well, the 
per cent sodium did not exceed 60. Well 32S/27E-6D1 showed a sodium ratio 
of 77 per cent. Water from six of the sampled wells showed total hardness 
in excess of 400 ppm. The predominant anion was sulfate. 

All of the 19 sampled wells scattered throughout the north- 
central portion of Kern County yielded water with a total dissolved solids 
concentration of less than 600 pfm and boron concentrations less than 0.5 
ppm. Total hardness ranged from 6 to 625 ppm. The ground waters were 
generally of a sodium bicarbonate type. 

Wells 26S/27E-9G1 and 27S/27E-29J1, located north of Bakersfield, 
yielded water with total dissolved solids concentration of 1160 and 925 Ppm, 
respectively; and total hardness exceeded 400 ppm in both v/ells. 

Comparison of analyses of samples collected in 1957 in Devils Den 
Oil Field area in the northwestern part of the county with those analyses 
pre"viously reported reveals no significant increase in mineral concentrations, 
The boron content of water from several of the monitored wells has varied 
slightly between 1953 and 1957. However, this variation in boron concentra- 
tion has been cyclic and no definite trend is apparent. Total dissolved 
solids in water from the monitored wells ranged between 1,080 and 3j550 ppm. 
The boron cccentration ranged from 1,8 ppm in water from well 25S/l8E-3Dl, 
to 9,7 ppm in water from well 25S/l9E-7Pl. Sulfates exceeded 450 ppm in 
samples from six of the monitored wells. All analyses s'n.owed sulfate to be 
the predominant anion. 



-48- 



UHGNTAN MEGILN (No. 6) 

The Lahontan Region consists of that area in California generally- 
east of the drainage divide of the Sierra Nevada, and the Tehachapi, San 
Gabriel, and San Bernardino Ko\intains (Plate 1). This region includes an 
area of apT roximately 33^000 square miles extending over 600 miles along the 
eastern boundary of California. All basins in this region have interior 
drainage. 

Ground water provides most of the water supply for the southern 
part of this region, although diverted surface waters constitute a minor 
source. The growth of some areas in the southern portion of the region has 
been affected hj the limited water supply. Precipitation is sporadic and 
generally less than five inches per year in the Antelope Valley-Mo jave 
River area. 

Of more than 50 ground water basins which have been identified 
in this region, only the Lower Hojave River Valley has been included in the 
monitoring program. 

Lower Mo.jave River Valley, Barstow to Yermo (6-40) 

The lower Kojave River Valley ground water basin extends for 
25 miles eastward from the "narrows" at Barstow. It varies in width from 
two to seven miles and comprises about 160 square miles. 

The portion of this ground water basin which is monitored extends 
from Barstow to Yermo. The possibility of degradation due to inflow of 
mineralized waters from the foothills on the south as well as from discharges 
to the dry river bed of sewage effluents and industrial wastes at Barstow 
and Nebo, create a threat to the ground water quality. Some of the wells 
located near tne eastern edge of the City of Barstow are no longer used. 
Taste and odor problems are prevalent in this area. Also, wells in this 



-49- 



vicinity contain boron in excess of limits recommended for irrigation water 
and fluoride concentrations in excess of limits specified in drinking water 
criteria. The mineral character of the ground waters is variable, although 
sodium is usually the predominant cation and bicarbonate is usually the 
predominant anion. A monitoring program was established in 1953 to maintain 
a check on the possible soiirces of degradation. In 1957, 16 samples were 
collected from 12 wells in this area. 

Comparison of 1957 analyses with those of prior years shows 
fluctuations in the analyzed constituents in most wells, but in general, 
no significant trend was discernable. Analyses of samples obtained from 
12 wells during 1957 show that total dissolved solids ranged from 312 to 
1,060 ppm, chlorides from 28 to I9I ppm, and total hardness from 98 to 350 
ppm. Analyses of samples from well 9N/1W-9G1 indicate an increase in boron 
from 0.14 ppm in August, 1951, to 1.20 ppm in May, 1955j and to 1.80 ppm in 
December, 1957. 



-50- 



CO]J0R.\DO RIVE BASIN REGIl N (No. 7) 
The Colorado River Basin Region is bounded on the north by the 
southern boundary of the Mojave River watershed, on the south by the Califor- 
nia-Mexico boundary, and on the west by the San Bernardino Mountains and the 
San Jacinto and Peninsular Ranges. The Colorado River and the Nevada State 
line bound the area on the east (Plate 1). This region comprises all basins 
draining into the Colorado River and Salton Sea. The region has an average 
width of more than 125 miles, an average length of about 150 miles, and 
includes an area of approximately 20,000 square miles. 
^ Forty-six ground water basins have been identified in this region, 
one of which has been included in the monitoring program, 

I 

Coachella Valley (7-21) 

The Coachella Valley basin includes an area of about 680 square 
miles. It is approximately 65 miles long, trends generally in a south- 
easterly-northwesterly direction, and ranges in width from about 3 miles 
at the northwestern end to 20 miles at the southeastern end. 

The mineral character of the well water varies throughout the 
monitored area. Calcium is usually the predominant cation in the north- 
western portion of the basin near the areas of replenishment from the '/White- 
water River system, while sodium is the predominant cation in the south- 
eastern portion of the basin. Bicarbonates are generally the predominant 
anion; however, sulfate anions are becoming more prominant in several wells 
in the northern portion of the area. This character shift may be the result 
of the use of imported Colorado River water in this portion of the area, 
where the producing zone is unconfined. 

A potential problem of ground water quality degradation due to 
percolation of inferior quality waste effluent and return irrigation water 



-51- 



exists in this valley. There is a possibility that degraded waters of the 
shallovj zone can move through abandoned or improperly constructed wells or 
through interconnected aquifers into the deeper zone. 

The monitoring program in the Coachella Valley ground water basin 
was initiated in 1953 to detect any pollution or degradation through inter- 
connected ground water zones, and to s'now any quality changes produced by 
imported water. In general, the area included in this monitoring y.rogram is 
the same area that uses Colorado River water to supply most of its water 
requirements. Twenty-five samples were taken from twelve wells in this area 

in 1957. 

Analyses show that the total dissolved solids content ranged from 
153 to 1,037 ppm, the highest concentration being found in well 7S/8E-22M1. 
High nitrate concentrations were f^und in well 5S/7E-33C1, 41 ppm in March, 
1957, and 63 ppm in October, 1957. However, analyses of samples from nearby 
vjells indicated this to be a localized condition. Four of the 12 wells 
sampled had high sodium percentaf-es, which ranged from 60 per cent to 92 
per cent. The fluoride content ranged from to 10 ppm, with three of the 
well waters having concentrations exceeding 1.5 ppm. 

A few of the monitored wells in Coachella Valley have s'lown an 
increase in total dissolved solids. The greatest change occurred in well 
7S/8E-22M1, in which total dissolved solids increased from 230 ppm in July, 
1954 to 1,037 ppm in September, 1957. 



-52- 



SANTA ANA REGION (No. 8) 
Santa Ana Region conprises the entire drainage area of the 
Santa Ana River, as well as all coastal basins draining into the Pacific 
Ocean between the Los Angeles-Orange County line on the north and west, 
and the drainage divide between Muddy and I-Ioro Canyons on the south (Plate 1), 
This region extends about 25 miles along the coast and includes an area of 
approximately 2,850 square miles. 

Nine ground water basins and 27 sub-basins have been identified 
in this region. Three of these basins have been included in the monitoring 
program: East Coastal Plain Pressure Area, Chino Basin, and Bunker Hill 
Basin. 

East Coastal Plain Pressure Area (8-1.01) 

East Coastal Plain Pressure Area, located in Orange County, 
fronts on the ocean a distance of 15 niiles between the Los Angeles-Orange 
County line and Newport Beach, extends inland an average distance of 10 
miles, and comprises approximately 180 square miles. 

The intrusion of saline water into the aquifers of the Santa Ana 
gap has been evident for several years. The lowering of the water table 
inland has reversed the historic seaward hydraulic gradient, permitting 
landward movement of saline water. In the Santa Ana gap, saline water has 
penetrated inland a distance of 2.5 miles in the Talbert water-bearing 
zone, one of the principal producing aquifers in this area. Saline waters 
have recently become evident inland from the fault zone under Bolsa Mesa. 
Determining the source of water quality impairment is made difficult in 
this ar a by the disposal of oil well brines into drainage ditches, bays, 
sloughs and directly on the land. The monitoring program was established 



-53- 



in 1953 to detect impairment to water quality caused by oil well brines 
and sea-water intrusion. 

Ranges in concentrations of pertinent constituents in 30 samples 
obtained from 18 wells during 1957 were as follows: total dissolved solids, 
from 172 to 15,600 ppm; chlorides, from 10 to 7j028 ppm; and, sulfates, from 
2 to 938 ppm. The better quality waters were generally sodium bicarbonate 
in character, v/hile the poorer quality waters were calcium chloride. 

Comparison of analyses from 1957 and prior years indicates a 
continuing increase in the concentration of total dissolved solids and 
chloride ions in water from the monitored v;ells located nearest the ocean. 
This increase is evident in wells 5S/11W-26F4, 27H4; 6s/10W-6L2, 8D9; 
6s/llW-3R2, 12F3, and 12Q1. Examples of the rates of chloride increase are 
illustrated by the analysis record of the following three wells. The 
chlorides in well 5S/11W-26F4 increased from 31 ppm in March, 1953, to 
282 ppm in September, 1957. The chlorides in well 6s/10W-6L2 increased from 
21 ppm in September, 1953, to 2,074 ppm in September, 1957. The chlorides 
in well 6S/11W-12Q1 increased from 5,070 ppm in September,. 1953, to 7,028 
ppm in March, 1957. In ground waters further inland, no increase in chlorides 
was detected and no appreciable changes occiirred in the mineral quality. 
The status of sea-water intrusion into the East Coastal Plain Pressure Area 
is shown on Plate 7* 

Chino Basin (8-2.01) 

Chino Basin, located in San Bernardino and Riverside Counties, 
occupies a portion of the Upper Santa Ana Valley. The basin is about 20 
miles in length, averages 12 miles in width, and comprises about 237 square 
miles. 

A number of industrial establishments in the San Bernardino County 



-54- 



portion of the Chino Basin discharge wastes to land. The monitoring program 
consists of nine wells which are situated below the critical waste dis- 
charges. The greatest concentration of wells is south of the Ontario 
International Airport near the aircraft maintenance and overhauling facil- 
ities. This monitoring program was established in 1953 to detect any adverse 
effects from improper disposal of industrial wastes. 

Concentrations and ranges of pertinent mineral constituents in 
21 samples from the nine wells during 1957 vjere as follows: total dissolved 
solids, from l65 to 650 ppm; nitrates, from 1.5 to 62 ppm; and chlorides, 
from 6 to 56 ppm. 

A comparison of mineral analyses covering the period 1953 to 
1956 reveals a trend of slightly increasing concentrations of both chlorides 
and total dissolved solids in most v/ell waters. This apparent trend was 
interrupted during 1957 when most of the analyses indicated minor decreases in 
total dissolved solids and chlorides. The analyses of samples from v;ell 
2S/7<^-23El indicate a more or less continuous annual decrease in the con- 
centration of dissolved minerals. Total dissolved solids in the October, 
1953j sample from this well was 858 PPm, while the June, 1957, sample con- 
tained only 530 ppm. However, this indicated improvement in water quality 
is considered to be local in extent. 

Bunker Hill Basin (8-2.06) 

Bunker Hill Basin, located in the Upper Santa Ana River drainage 
area, abuts against the high, rain-catching San Bernardino Mountains for 
a distance of 20 miles. Bvinker Hill Basin is approximately 8 miles in width 
and encompasses about 92 square miles in the eastern portion of this plain. 

The monitoring program was initiated in 1953 to detect changes 
in water quality caused by disposal of industrial v/astes to land. 



-55- 



Originally, monitoring wells were selected near the site of the waste 
disposal siimps of the Culligan Zeolite Company north of the City of San 
Bernardino. Since then, additional wells have been selected for sampling 
alonr^ the reach of the Santa Ana River below Redlands sewage treatment plant 
and Norton Air Force Base. 

During 1957^ 15 ground water samples were obtained from eight wells 
in this area. Analyses of these samples show the following concentrations 
of important mineral constituents: total dissolved solids, from 160 to 475 
ppm; chlorides, from 7 to 39 ppm; and boron, from zero to 1.0 ppm. 

Comparison of 1957 analyses with previous year's analyses indicates 
that several changes in water quality have taken place within this basin. 
Analyses of water samples from well 1N/4W-29E3, located below the Culligan 
Zeolite Company's waste disposal sumps, show a progressive increase in 
calcium, sulfate and total dissolved solids since 1954, as shown in the 
following, tabulation: 









Total dissolved 




Calcium 


Sulfate 


solids 


Date 


ppm 
66 


ppm 
34 


ppm 


12-15-54 


280 


9-20-55 


77 


60 


290 


3-14-56 ■■ 


78 


72 


390 


9-13-56 


86 


82 


438 


3-11-57 


90 


108 


382 


9-25-57 


107 


142 


475 



No significant change in sodium, chloride, or nitrate is noticeable. 
Water from well 1S/4W-29F1, which is also located near the Culligan 
Zeolite Company's waste disposal sumps, shows similar characteristics. 



-56- 



Well lS/3W-Sia, located below the City of Redlands sewage treat- 
ment plant, shows a continuous increase in total dissolved solids from 
178 ppm in August, 1955, to 453 ppm in September, 1957. 



-57- 



SAN DIEGO REGION (No. 9) 

The San Diego Region comprises all basins draining into the Pacific 
Ocean from the draina.^e divide between Muddy and Koro Canyons in Orange County 
on the north, to the California-Mexico Boundary on the south, and averages 
45 miles in v;idth (Plate 1). It occupies an area of approximately 3^830 
square miles. 

Fifty-four ground water basins have been identified in this region. 
Three of these basins, San Luis Rey Valley, El Cajon Valley, and Tia Juana 
Basin, are included in the monitoring program, 

San Luis Rey Valley (9-7) 

San Luis Rey Valley is a long, narrow river valley in northern San 
Diego County, extending approximately 30 miles inland from the Pacific Ocean. 
Only the lower portion of this valley, which is adjacent to the ocean and 
extends approximately six miles inland, is included in the monitoring program. 
The valley floor in this area is about one mile wfide. The principal pumping 
zone consists of about 100 feet of unconfined permeable sands and gravel 
occurring beneath a section of fine sand, silt, or clay. 

Deterioration of ground water quality in wells near the coast has 
been evident for" many years. This deterioration is attributed to an adverse 
salt balance, inflov; of water of inferior quality from adjacent older sedi- 
ments, and sea-water intrusion. Under present and expected futui conditions 
of development, continued impairment may render more and more of the ground 
water unsuitable for domestic use and irrigation. The monitoring network in 
this valley was initiated in 1953. 

The character and mineral quality of ground water in this monitored 
area is extremely variable. Mineral analyses of 18 samples taken from 11 
v;ells in 1957 showed the following: Chloride concentrations ranged from 97 ppm 



-58- 



I 



at a well 5.3 miles from the coast to 10,030 ppm at a well 0,7 mile from 

the coast, total dissolved solids ranged from 420 to 20,360 ppm, and per cent 

sodium ranged from 32 per cent to 74 per cent. 

Review of the analyses indicates that deterioration of ground 
water quality has continued. Seven of the 11 monitoring wells show increases 
in chlorides and total dissolved solids during the period of record. 

El Ca.ion Valley (9-16) 

The El Cajon Valley is a srr.all basin with an area of approximately 
22 square riles located in San Diego County. It is approximately five miles 
wide and four miles long. The area is surrounded by low hills excect for a 
small opening into the San Diego River Valley. The valley is drained by 
Forester Creek, which is tributary to the San Diego River. 

This area has been included in the monitoring program to detect 
changes in quality due to use and reuse of ground water and changes resulting 
from the importation of Colorado River water. Twenty- two samples were taken 
from 12 wells in this area during 1957. 

Review of the analyses for 1957 indicates that all monitoring 
wells yielded waters high in total dissolved solids, ranging from 768 to 
1,792 ppm. High chlorides v/ere present in almost all of the well waters, 
and ranged from 195 to 890 ppm. The nitrate content ranged from to 87 ppm 
with the concentration exceeding 44 ppm in 5 of the monitoring wells. 

No significant changes in mineral quality have been detected in 
the ground waters of this basin since the start of the monitoring program 
in 1953. However, most of the v/ells have s'lown slight increases in chloride 
content and total dissolved solids over this four-year period of record. 



-59- 



Tia Juana Basin (9-19) 

Tia Juana Basin, the most southerly ground water basin in the San 
Diego Region, is situated approximately 15 miles south of the City of San 
Diego. The ground water basin extends along the Tia Juana River into Mexico. 
The Tia Juana Basin, as referred to herein, includes only the portion within 
California. This basin is about 5 miles in length, averages 1.5 miles in 
width and has an area of approximately 7 square miles. 

Data obtained in other investigations indicate that ground water 
storage capacity in Tia Juana Basin is quickly filled during periods of 
above-average rainfall and runoff. During ensuing periods of drought, 
when use from the ground water basin exceeds supply, ground water levels 
in the lovjer portion of the valley are drawn belov/ sea level. During the 
period since 1947, quality degradation has been noted in waters from several 
wells in the coastal area. The coastal portion of this valley was included 
in the monitoring program in 1953 to determine the extent and rate of ground 
water deterioration. A shallow unconfined zone and a lower confined zone 
occur in the monitored portion of the valley. 

Ground water in Tia Juana Basin is of sodium chloride type, and 
although of relatively inferior quality, is being used for both domestic and 
agricultural purposes. The poor quality of this gr'^iund water may be due to 
adverse salt balance, reuve of water, sea-water intrusion, inflow of connate 
water from older sediments flanking and underlying the valley, or a combina- 
tion ''f these conditions. 

The analyses of 20 samples collected from 12 wells during 1957 
show a chloride range from 406 to 4,789 ppm. Total dissolved solids content 
ranged from 1,420 to 11,180 ppm. Nine of the twelve monitoring wells in the 
basin show a progressively poorer quality of water with time. ,ifell 19S/2W- 
5C6 showed a chloride content of 649 PPm in August, 1953, 724 ppni in 



-60- 



September, 1953, 1,163 FP^ in April, 1955, 3,540 pim in July, 1956, and 
.,,430 ppra in October, 1957. This increase inay be due to sea-wator intrusion. 
.veil 19S/2W-2E1, which is alnost four miles inland, showed a chloride content 
of 638 ppm in 1953, and increased to 862 ppm in 1957. This is believed to be 
primarily due to adverse salt balance within this basin. 



-61- 



PLATE I 



1-1 
1-3 

1-4 

1-5 

1-8 

1-10 

1-15 

1-16 

1-17 

1-18 



NORTH ■ 
Smith Ri- 
Butte Va 
Shasta \ 
Scott Riv 
Mad Rivi 
Eel River 
Ukiah V< 
Sanel Vc 
Alexand 
Santa Re 



SAN FRy 
2-9a Santa Cli ^ 
2-9b Santa CIt 
2-10 Livermon 



3-2 

3-4 
3-7 
3-12 
3-13 



CENTRAI 
Pajaror 
Salina ■^j, 
Carme'^ 
Santa '^' 



LOS AN 

4-4.01 Oxnar 

4-11.02 WestC 
Arec 
Torr 
Ath< 

4-11.03 Centra 

4-11.04 sure 

Fore 

4-13.01 Mains 




^.^i/ 




m 



STATE OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

DIVISION OF RESOURCES PLANNING 

QUALITY OF GROUND WATERS IN CALIFORNIA 

MONITORED AREAS 
1957 

SCALE OF MILES 
10 10 20 30 40 50 

-WJ-^ I I I 1 1 



INDEX TO AREAS 



NOfiTH COASTAL REGION {No. 1) 
Smith River Plain 
Butte Volley 

Shosta Valley 

Scoti River Volley 
8 Mod River Valley 
10 Eel River Valley 

15 Ukioh Volley 

16 Sonel Valley 

17 Alexortder Valley 

18 SontoRoiO Volley 

SAN FRANCISCO BAY REGION (No, 2 
2-9o SonlaCloro Valley. East Boy Area 
2-9b Sonto Cloro Volley. South Boy Area 
2-10 Livermore Volley 

CENTRAL COASTAL REGION (No. 3) 
3-2 Pojoro Volley 

3-4 Salinas Volley 

3-7 Cormel Valley 

3-12 Sonto Maria River Volley 
3-13 Cu/omo Volley 

LOS ANGELES REGION (No, 4) 

i-4.01 Gunard Plom Pressore Area 

4-1102 Weil Coost Boiin 

Areo of Seo-Woler Intrusion 

Alhen; Areo 

4-1 1 03 Cer^irol Coostol Ploin Prei- 

4-1 1 O'l sure Areo and Los Angeles 

Foreboy Areo 

4-1 3.01 Mom Son Gabriel Basin 



CENTRAL VALLEY REGION (No. 5) 

5-13 Upper Lake Volley 

5-15 Kelse/ville Volley 

5-21a Sutter County 

5-21b Yolo County. Copoy Volley 

5-21c Socromenlo County 

5-22o San Jooquin County 

5-22b Stanislaus County 

5-22c Merced County 

5-22d Modera County 

5-22e Fresno County 

5-22) Kern County 



LAHONTAN REGION (No. 6) 
Lower Mo|Ove River Volley, 
Borstow to Yermo 



COLORADO RIVER BASIN REGION (No. 7) 
7-21 Coochello Volley 



SANTA ANA REGION (No. 6) 
8-1.01 East Coostol Plain Pressure Area 
8-2.01 Chino Bosin 
8-2.06 Bunker Hill Basin 



SAN DIEGO REGION (No. 9) 
9-7 Son Luis Rey Volley 

9-16 El Cajon Volley 
9-19 Tia Juono Valley Basin 







r\ 



PLATE 2 




OEPARTMEMT OF WATER RESOURCES 1987 




STATE OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

DIVISION OF RESOURCES PLANNING 

QUALITY OF GROUND WATERS IN CALIFORNIA 

STATUS OF SEA^TER INTRUSION 
PAJARO VALLEY 



SCiLE OF f^EET 

4000 0000 aooo 



DEPARTMENT OF WATER RESOURCES 1957 




.„«^ 



-^\J 



X 



■ ■'' ^ .'■ 



o 

' ^> f 



^ 



K . 






/ o 






:■/' 



^^ 



r^ 



, ^ 






X \^ /x 

<?- 
o 

- ^-^ <?- /x , 




:./" 



/ 



^^.-.C^ 




LEGEND 




LINE OF 100 PARTS PER MILLION CHLORIDE 
CONCENTRflTlON IN 180 FOOT AQUIFER 

1957 *v_— ^ 

1954 


LINE OF 100 PARTS PER MILLION CHLORIDE 

CONCENTRATION IN 400 FOOT AQUIFER 




1957 ~—--~^ 




1954 





STATE OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

DIVISION OF RESOURCES PLANNING 

QUALITY OF GROUND WATERS IN CALIFORNIA 

STATUS OF SEA^TER INTRUSION 
SALINAS VALLEY 



SCfiLE Of" f"E£' 

O 4000 BOQO 



DEPARTMENT OF WATER RESOURCES 1957 




DEPARTMENT OF WATER RESOURCES 1957 




0EP6HTMENT OF WATER RESOURCES 1957 




CONCENTRATION IN GROUND WATERS 
SUMMER 1957 
1943-44 



STATE OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

DIVISION OF RESOURCES PLANNING 

QUALITY OF GROUND WATERS IN CALIFORNIA 

J,. ^8/;. I STATUS OF SEA^TER INTRUSION 

"^^^'■^'^^i-^-i ^' EAST COASTAL PLAIN PRESSURE AREA 

NEWPbRtV ^^^V-r?"^ 
BEACH 



SCALE OF FEET 

I dOOO BOOO 



DEPARTMENT OF WATER RESOURCES 1957 



APPENDIX A 

MONITORING AREA INFORMATION 

Page 
Number of Monitoring Wells and 

Sampling Times, 1957 A-1 

General Information on Monitored Areas, 1957 A-3 



NUMBER OF MONITORING WELLS AND SAMFLING TIMES 

1957 



Monitored Area 

NORTH COASTAL REGION (No. l) 
Smith River Plain (1-1) 
Butte Valley (1-3) 
Shasta Valley (1-/+) 
Scott River Valley (1-5) 
Mad River Valley (1-8) 
Eel River Valley (I-IO) 
Ukiah Valley (1-15) 
Sanel Valley (l-l6) 
Alexander Valley (1-17) 
Santa Rosa Valley (1-18) 

SAN FRAi^J CISCO BAY REGION (No. 2) 
Santa Clara Valley (2-9) 
East Bay Area (2-9a) 
South Bay Area (2-9b) 
Livermore Valley (2-10) 

CENTRAL COASTAL REGION (No. 3) 
Pajaro Valley (3-2) 
Salinas Valley (3-4) 
Carmel Valley (3-7) 
Santa Maria River Valley (3-12) 
Cuyama Valley (3-13) 



LOS ANGELES REGION (No. 4) 

Oxnard Plain Area (4-4.01) 20 

West Coast Basin (4-11.02) 

Area of Sea-Water Intrusion 6 
Torrance Area 5 

Athens Area 7 

Central Coastal Plain Pressure 
and Los Angeles Forebay 
Area (4-11.03 and 4-11.04) 6 

Main San Gabriel Basin (4-13. 01) 11 

CENTRAL VALLEY REGION (No. 5) 

Upper Lake Valley (5-13) 2 

Kelseyville Valley (5-15) 10 
Sacramento Valley (5-21) 

Sutter County (5-21a) 33 
Yolo County, Capay Valley (5-21b) 9 

Sacramento Cotinty (5-21c) 2? 



No. of 

Wells 


Sampling Time 


15 

10 

6 

4 

6 

11 

11 

6 

9 

20 


September and December 

August 

March and July 

July 

February and December 

October 

August 

August 

January 

January 


15 
17 
45 


August and September 

August 

February through October 


25 
47 

7 
10 

6 


August 

June and July 

August 

November 

September 



April and November 

February through December 
January through December 
February 



May and December 
June and December 



July 
July 

July 
July 
July 



A-1 



NUMBER OF MONITORING WELLS AND SAMPLING TIMES 

1957 
(continued) 



Monitored Area 

CENTRAL VALLEY REGION (No. 5) cont'd 
San Joaquin Valley (5-22) 
San Joaquin County (5-22a) 
Stanislaus County (5-22b) 
Merced County (5-22c) 
Madera County (5-22d) 
Fresno County (5-22e) 
Kern County (5-22f) 

LAHONTAN REGION (No. 6) 

Lower Mojave River Valley, 
Bar stow to Yermo (6-/4.O) 

COLORADO RIVER BASIN REGION (No. 7) 
Coachella Valley (7-21) 

SANTA ANA REGION (No. 8) 

East Coastal Plain Pressure Area 

(8-1.01) 
Chino Basin (8-2.01) 
Bunker Hill Basin (8-2.06) 

SAN DIEGO REGION (No. 9) 

San Luis Rey Valley (9-7) 
El Cajon Valley (9-16) 
Tia Juana Basin (9-19) 



No. of 




Wells 


Sampling Time 


43 


June through November 


45 


June through September 


41 


July through September 


28 


July 


67 


July 


42 


July and August 



12 



12 



May through December 



March and September 



18 


June and September 


9 


June and December 


8 


February through December 


11 


June and October 


12 


July and October 


12 


July and October 



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A-20 



APPENDIX B 
WELL DATA 



Well Numbering System 
Well Data 



Page 
. B-1 
. B-2 



Well Numbering System 
Wells selected for inclusion in the ground water quality 
monitoring network are assigned numbers by township, range and section, 
based upon their location. The numberinf system is the same as that 
utilized by the United States Geological Survey. Under this system each 
section is divided into 40-acre plots, which are lettered as follows: 



D 


C 


B 


A 


E 


F 


G 


H 


M 


L K 

1 


J 


M 


P 


Q 


R 



Wells are numbered within each of these 4C-acre plots according 
to the order in which they are located. For example, a well having a 
number 3N/6E-24A2, MDB&M, is located in Township 3 North, Range 6 East, 
and in Section 24, Mount Diablo Base and Meridian. It is further identi- 
fied as the second well located in the 40-acre plot lettered A. Analyses 
of water samples reported herein are from wells located throughout the 
State; therefore, they are referenced to Humboldt Base and Meridian and 
San Bernarcino Base and Meridian as well as the Mount Diablo Base and 
Meridian. The appropriate reference grid is indicated in appendixes 
B and C in the coliomn headed "State Well Number and Other Number." 



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APPENDIX C 
WATER QUALITY 

Page 

Laboratory Methods and Procedures C-1 

Water Quality Criteria C-3 

Criteria for Drinking Water C-3 

Criteria for Irrigation Water C-6 

Criteria for Industrial Uses C-7 

Analyses of Ground Water, 1957 C-10 



Laboratory Methods and Procedures 

Analytical methods used in determination of various constituents 
reported in the follovdng tables conform, in general, to those presented 
in "Standard Methods for the Examination of Water and Sewage," 10th Edition, 
195 5 > a joint publication of the American Public Health Association, the 
American Water Works Association, and this Federation of Sewage and Industrial 
Wastes Associations. For certain specific analyses, the methods described 
in "Methods of Water Analyses," 1956, a United States Geological Survey 
manual now in preparation, have been used. 

Laboratory analyses of the water samples are performed by the Water 
Quality Branch of the United States Geological Survey; by the Department of 
Water Resources laboratories located in Sacramento, San Bernardino, and 
Riverside; or by various other public or private laboratories, each as in- 
dicated in the right hand column of the tables. 

The following tabulation indicates the tests made and the con- 
stituents usually analyzed in the ground water quality monitoring program. 



C-1 





: Anal 


y s i s 


Constituent 


: Standard 


: Partial 




: mineral 


: mineral 


Specific conductance 


I 


X 


pH 


X 


X 


Total dissolved solids 


X 




Per cent sodium 


X 




Hardness 


X 


X 


Temperature 


X 


X 


Calcium 


X 




Magnesium 


X 




Sodiiam 


X 


X 


Potassium 


X 




Carbonate 


X 




Bicarbonate 


X 




Sulfate 


X 




Chloride 


X 


X 


Nitrate 


X 




Fluoride 


X 




Boron 


X 


X 


Silica 


X 





C-2 



Water Quality Criteria 
Presented herein are general criteria and limiting values present- 
ly used by the Department of Water Resources in evaluating and classifying 
water quality. These values should be considered only as guides and ind ■ 
cators and not as absolute limitations. 

Criteria lor Drinking Water 

Water that is used for drinking and culinary purposes must be clear, 
colorless, odorless, pleasant to the taste, and must not endanger the lives 
or health of human beings. These general reqxiirements pertain to the water 
as it is finally delivered to the consumer; prior treatment may be necessary 
in order to comply vd.th these requirements. 

Chapter 7 of the California Health and Safety Code contains laws 
and standards relating to domestic water supply. Section 4010.5 of this code 
refers to the drinking water standards promulgated by the United States 
Public Health Service for water used on interstate carriers. These criteria 
have been adopted by the State of California. They are set forth in detail 
in United States Public Health Report, Volume 6l, No. 11, March 15, 1946. 

Accoramg to Section 4-2 of the above-named report, chemical sub- 
stances in drinking water supplies, either natural or treated, should not 
exceed the concentrations shown in Table C-1. 



C-3 



TABLE C-1 

LIMITING CONCENTRATIONS OF 
MINEEIAL CONSTITUENTS IN DRINKING WATER 

United States Public Health Service 
Drinking Water Standards, 1946 



Constituent 



ppm 



Mandatory 

Fluoride (F) 

Lead (Pb) 

Selenium (Se) 

Hexavalent chromium (Cr ) 

Arsenic (As) 
Nonmandatory but Recommended Values 

Iron (Fe) and "manganese (Mn) together 

Magnesium (Mg) 

Chloride (Cl) 

Sulfate (SO/^) 

Copper (Cu) 

Zinc (Zn) 

Phenolic compounds in terms of phenol 

Dissolved solids, desirable 

Dissolved solids, permitted 



1.5 

0.1 

0.05 

0.05 

0.05 

0.3 
125 
250 
250 
3.0 
15 
0.001 
500 
1000 



Interim standards for certain mineral constituents have recently 
been adopted by the California State Board of Public Health. Based on 
these standards, temporary permits may be issued for drinking water supplies 
failing to meet the United States Public Health Service Drinking Water 
Standards, provided the mineral constituents in the following table are not 
exceeded. 



C-4 



UPPER LIMITS OF TOTAL SOLIDS AND SELECTED MINERALS IN 
DRINKING WATER AS DELIVERED TO THE CONSUMER 

Permit Temporary permit 

Total solids 500 (1000)* 1500 ppm 

Sulfates (SO/,) 250 (500)-^ 600 ppm 

Chlorides (Cl) 250 (500)* 600 ppm 

Magnesium (Mg) 125 (125) 150 ppm 

* Numbers in parentheses are maximum permissible, 
to be used only where no other more suitable 
waters are available in sufficient quantity for 
use in the system. 

The California State Board of Health recently has defined the 

following maximum safe amounts of fluoride in drinking water in relation 

to mean annual temperature: 

Mean annual Maximum mean monthly 
temperature fluoride ion concentration 
in °F in ppm 



50 1.5 

60 1.0 

70 - above 0.7 

Other organic or mineral substances may be limited in concentration 
if their presence in water renders it hazardous as determined by state or 
local health authorities. 

The relationship of infant methemoglobinemia (a reduction of 
oxygen content in the blood, constituting a form of asphyxia) to nitrates 
in the water supply has led to limitation of nitrates in drinking water. 
The California State Department of Public Health has recommended a tentative 
limit of 10 ppm nitrate nitrogen {l^U ppm nitrates) for domestic waters. 
Water containing higher concentrations of nitrates may be considered to be 
of questionable quality for domestic and municipal use. 

An additional factor with which users are concerned is the hard- 
ness of water. Hardness is principally due to calcium and magnesium and is 



C-5 



generally evidenced to the consumer by inability to develop suds when using 
soap. In general domestic use, hardness can result in increased soap con- 
sumption and excessive repairs to plumbing. The follovdng classification of 
water according to hardness has been suggested by the United States Geological 
Survey: 

Range of hardness 

in ppm Relative classification 

0-55 Soft 

56 - 100 Slightly hard 

101 - 200 Moderately h ard 
Greater than 200 Very hard 

Criteria for Irrigation Water 

The following criteria for mineral quality of irrigation water have 

been developed at the University of California at Davis and at the United 

States Department of Agriculture Regional Salinity Laboratory at Riverside. 

Because of diverse climatological conditions and variations in crops and 

I 
soils in California, only general limits of quality for irrigation waters 

can be suggested. The Department uses the three broad classifications of 

irrigation waters listed in Table C-2. 



C-6 



TABLE C-2 



QUALITATIVE CLASSIi-^ICATION OF IRRIGATION '.'.ATERS 




Class 1 



Class 2 



Class 3 



Excellent to good "Good to injurious 



: Injurious to 

: unsatisfactory 

(Suitable for most: (Possibly harmful: (Harmful to 

plants under any : for some crops :raost crops and 
conditions of soil: under certain : unsatisfactory 

and climate) : soil conditions) : for all but the 
I :most tolerant) 



Total dissolved solids 

In ppm Less than 700 

In conductance, ECxlO^ Less than 1,000 

Chloride ion concentration 



700 - 2,000 More than 2,000 
1,000 - 3,000 More than 3,000 



In milliequivalents 
per liter 

In ppm 

Sodivim in per cent of 
base constituents 

Boron, in ppm 



Less than 5 
Less than 175 



Less than 60 
Less than 0.5 



5 - 10 
175 - 350 



60 - 75 
0.5 - 2.0 



More than 10 
More than 350 



More than 75 
More than 2.0 



Criteria for Industrial Uses 

Quality criteria for the diversified uses of water in industry 
range from exacting requirements for makeup water used in high pressure 
boilers to minimum requirements for water for washdown and ore quenching. 

Industrial use of water includes utilization for food processing. 
Except for certain canning operations, water used in food processing must at 
least conform to quality requiranents for drinking water supplies. The 
requirements of some food processing industries, however, are more stringent 
than those contained in the drinking water standards of the United States 
Public Health Service. 



C-7 



Because of the large rmmber of industrial uses of water with widely- 
varied quality requirements, it is difficult to establish more than broad 
criteria of quality. Therefore, these requirements are expressed, vihere 
possible, for groups of related industries rather than for individual plants. 
The general quality requirements of several single industries and for repre- 
sentative major groups of industrial uses are listed in Table C-3. 



C-8 



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THIS BOOK IS DUE ON THE LAST DATE 
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Physical Sciences Libiar/ 



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Book Slip-20m-8,'61(C1623s4)458 




::aOU9h 



California. Dept, of 
water resources. 



PHYS:CAL 
SCIENCES 
UBRARV 



Call Number: 

TG621; 

C2 

A2 



Ac. itfijl- 



^ 



yNIVERSilY OF CALIFORNIA DAVIS '" 



.III III IIIINIi lll|ii|||l|i||,„„ 

3 1175 02037 6920 



LIBRARY 

UNIVERSITY OF CALIFOKNIA 



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